{"id":19274,"date":"2026-07-29T11:55:20","date_gmt":"2026-07-29T11:55:20","guid":{"rendered":"https:\/\/www.diginerve.com\/blogs\/?p=19274"},"modified":"2026-07-29T11:55:20","modified_gmt":"2026-07-29T11:55:20","slug":"dyspnea-dyspnoea-causes-symptoms-diagnosis-treatment-and-prevention","status":"publish","type":"post","link":"https:\/\/www.diginerve.com\/blogs\/dyspnea-dyspnoea-causes-symptoms-diagnosis-treatment-and-prevention\/","title":{"rendered":"Dyspnea (Dyspnoea): Causes, Symptoms, Diagnosis, Treatment and Prevention"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Dyspnea, also spelt dyspnoea, is the subjective sensation of difficult, uncomfortable or laboured breathing. Patients may describe it as breathlessness, shortness of breath, chest tightness, air hunger, inability to take a deep breath or increased effort required to breathe.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Dyspnea is a symptom rather than an independent disease. It may result from disorders involving the respiratory, cardiovascular, haematological, neuromuscular, metabolic or psychological systems. Its severity ranges from mild breathlessness during strenuous activity to severe respiratory distress at rest.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The American Thoracic Society describes dyspnea as a subjective experience of breathing discomfort composed of qualitatively distinct sensations that vary in intensity. Because it is subjective, the degree of perceived breathlessness may not always correlate directly with oxygen saturation, respiratory rate or the severity of the underlying disease.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">What Is Dyspnea?<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Dyspnea occurs when the physiological demand for ventilation is not adequately matched by the body\u2019s capacity to breathe. This mismatch may result from:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Increased respiratory drive<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Airflow obstruction<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Reduced lung compliance<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Impaired gas exchange<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Respiratory muscle weakness<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cardiovascular dysfunction<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Reduced oxygen-carrying capacity<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Abnormal perception of breathing<\/span><\/li>\n<\/ul>\n<p><strong>Dyspnea should be differentiated from related terms:<\/strong><\/p>\n<table style=\"width: 94.324%; height: 543px;\">\n<tbody>\n<tr style=\"height: 55px;\">\n<td style=\"text-align: center; height: 55px; width: 29.3714%; border-style: solid; border-color: #000000;\"><b>Term<\/b><\/td>\n<td style=\"text-align: center; height: 55px; width: 83.8857%; border-style: solid; border-color: #000000;\"><b>Definition<\/b><\/td>\n<\/tr>\n<tr style=\"height: 55px;\">\n<td style=\"text-align: center; height: 55px; width: 29.3714%; border-style: solid; border-color: #000000;\"><b>Dyspnea<\/b><\/td>\n<td style=\"text-align: center; height: 55px; width: 83.8857%; border-style: solid; border-color: #000000;\"><span style=\"font-weight: 400;\">Subjective sensation of breathing discomfort<\/span><\/td>\n<\/tr>\n<tr style=\"height: 55px;\">\n<td style=\"text-align: center; height: 55px; width: 29.3714%; border-style: solid; border-color: #000000;\"><b>Tachypnea<\/b><\/td>\n<td style=\"text-align: center; height: 55px; width: 83.8857%; border-style: solid; border-color: #000000;\"><span style=\"font-weight: 400;\">Abnormally increased respiratory rate<\/span><\/td>\n<\/tr>\n<tr style=\"height: 55px;\">\n<td style=\"text-align: center; height: 55px; width: 29.3714%; border-style: solid; border-color: #000000;\"><b>Hyperpnea<\/b><\/td>\n<td style=\"text-align: center; height: 55px; width: 83.8857%; border-style: solid; border-color: #000000;\"><span style=\"font-weight: 400;\">Increased depth of breathing<\/span><\/td>\n<\/tr>\n<tr style=\"height: 79px;\">\n<td style=\"text-align: center; height: 79px; width: 29.3714%; border-style: solid; border-color: #000000;\"><b>Hyperventilation<\/b><\/td>\n<td style=\"text-align: center; height: 79px; width: 83.8857%; border-style: solid; border-color: #000000;\"><span style=\"font-weight: 400;\">Ventilation exceeding metabolic requirements, causing reduced arterial carbon dioxide<\/span><\/td>\n<\/tr>\n<tr style=\"height: 55px;\">\n<td style=\"text-align: center; height: 55px; width: 29.3714%; border-style: solid; border-color: #000000;\"><b>Orthopnea<\/b><\/td>\n<td style=\"text-align: center; height: 55px; width: 83.8857%; border-style: solid; border-color: #000000;\"><span style=\"font-weight: 400;\">Breathlessness occurring in the supine position<\/span><\/td>\n<\/tr>\n<tr style=\"height: 55px;\">\n<td style=\"text-align: center; height: 55px; width: 29.3714%; border-style: solid; border-color: #000000;\"><b>Platypnea<\/b><\/td>\n<td style=\"text-align: center; height: 55px; width: 83.8857%; border-style: solid; border-color: #000000;\"><span style=\"font-weight: 400;\">Breathlessness that worsens while sitting or standing<\/span><\/td>\n<\/tr>\n<tr style=\"height: 55px;\">\n<td style=\"text-align: center; height: 55px; width: 29.3714%; border-style: solid; border-color: #000000;\"><b>Trepopnea<\/b><\/td>\n<td style=\"text-align: center; height: 55px; width: 83.8857%; border-style: solid; border-color: #000000;\"><span style=\"font-weight: 400;\">Dyspnea occurring in one lateral decubitus position<\/span><\/td>\n<\/tr>\n<tr style=\"height: 79px;\">\n<td style=\"text-align: center; height: 79px; width: 29.3714%; border-style: solid; border-color: #000000;\"><b>Paroxysmal nocturnal dyspnea<\/b><\/td>\n<td style=\"text-align: center; height: 79px; width: 83.8857%; border-style: solid; border-color: #000000;\"><span style=\"font-weight: 400;\">Sudden breathlessness that awakens a person from sleep<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h2><span style=\"font-weight: 400;\">Classification of Dyspnea<\/span><\/h2>\n<p><b>Acute Dyspnea<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Acute dyspnea develops over minutes to hours or several days.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Potential causes include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Acute asthma exacerbation<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pulmonary embolism<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pneumonia<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pneumothorax<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Acute pulmonary oedema<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Acute coronary syndrome<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Anaphylaxis<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Foreign-body aspiration<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Upper airway obstruction<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Metabolic acidosis<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Acute severe dyspnea may indicate a medical emergency.<\/span><\/p>\n<p><b>Chronic Dyspnea<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Chronic dyspnea generally persists for more than four to eight weeks.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Common causes include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Chronic obstructive pulmonary disease<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Bronchial asthma<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Interstitial lung disease<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Heart failure<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pulmonary hypertension<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Anaemia<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Obesity<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Physical deconditioning<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Neuromuscular disease<\/span><\/li>\n<\/ul>\n<p><b>Exertional Dyspnea<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Exertional dyspnea occurs during physical activity. It may represent an early manifestation of pulmonary, cardiac or haematological disease.<\/span><\/p>\n<p><b>Dyspnea at Rest<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Breathlessness at rest generally indicates more severe physiological impairment than dyspnea occurring only during substantial exertion.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Pathophysiology of Dyspnea<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The perception of breathlessness results from complex interactions between respiratory neural pathways, mechanical receptors, chemoreceptors and cortical sensory processing.<\/span><\/p>\n<p><b>Increased Respiratory Drive<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Central and peripheral chemoreceptors respond to:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hypercapnia<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hypoxaemia<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Metabolic acidosis<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Fever<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Exercise<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">These stimuli increase respiratory drive. When the increased drive cannot produce adequate ventilation, the patient experiences air hunger.<\/span><\/p>\n<p><b>Neuromechanical Dissociation<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Neuromechanical dissociation occurs when the brain generates a strong respiratory motor command, but the respiratory system fails to produce the expected airflow or chest-wall movement.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This may occur in:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Airway obstruction<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Reduced lung compliance<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Respiratory muscle weakness<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Dynamic hyperinflation<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Severe obesity<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The discrepancy between intended and achieved ventilation contributes to breathing discomfort.<\/span><\/p>\n<p><b>Increased Work of Breathing<\/b><\/p>\n<p><span style=\"font-weight: 400;\">The work of breathing increases when there is:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Bronchoconstriction<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Airway mucus obstruction<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pulmonary fibrosis<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pleural disease<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Chest-wall restriction<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hyperinflation<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Respiratory muscle fatigue<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Patients may describe this as effortful or laboured breathing.<\/span><\/p>\n<p><b>Abnormal Gas Exchange<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Ventilation-perfusion mismatch, diffusion impairment or alveolar hypoventilation may produce hypoxaemia or hypercapnia, stimulating ventilation and increasing the sensation of dyspnea.<\/span><\/p>\n<p><b>Cardiovascular Mechanisms<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Reduced cardiac output may impair oxygen delivery to tissues. Pulmonary venous congestion can reduce lung compliance and stimulate pulmonary receptors, producing breathlessness.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Causes of Dyspnea<\/span><\/h2>\n<p><b>Respiratory Causes<\/b><\/p>\n<p><b>Bronchial Asthma<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Asthma causes reversible airway obstruction due to bronchial smooth-muscle contraction, mucosal oedema and mucus hypersecretion.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Associated features may include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Episodic wheezing<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cough<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Chest tightness<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Nocturnal symptoms<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Trigger-related breathlessness<\/span><\/li>\n<\/ul>\n<p><b>Chronic Obstructive Pulmonary Disease<\/b><\/p>\n<p><span style=\"font-weight: 400;\">COPD produces persistent airflow limitation, air trapping and dynamic hyperinflation. Patients may experience progressive exertional dyspnea, chronic cough and sputum production.<\/span><\/p>\n<p><b>Pneumonia<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Infection causes alveolar inflammation and accumulation of fluid or purulent material, impairing gas exchange. Clinical features may include fever, cough, sputum production, pleuritic chest pain and tachypnea.<\/span><\/p>\n<p><b>Pulmonary Embolism<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Pulmonary embolism occurs when a thrombus obstructs the pulmonary arterial circulation. It may present with sudden dyspnea, pleuritic chest pain, tachycardia, haemoptysis or syncope.<\/span><\/p>\n<p><b>Pneumothorax<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Air entering the pleural cavity causes partial or complete lung collapse. Sudden unilateral chest pain and acute dyspnea are characteristic.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A tension pneumothorax may cause haemodynamic instability and requires immediate decompression.<\/span><\/p>\n<p><b>Interstitial Lung Disease<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Interstitial lung diseases produce inflammation and fibrosis of the pulmonary interstitium, resulting in restrictive physiology and impaired diffusion.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Typical features include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Progressive exertional dyspnea<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Dry cough<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Fine inspiratory crepitations<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Reduced diffusion capacity<\/span><\/li>\n<\/ul>\n<p><b>Pleural Effusion<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Fluid accumulation in the pleural space compresses the lung and restricts ventilation.<\/span><\/p>\n<p><b>Upper Airway Obstruction<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Potential causes include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Anaphylaxis<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Laryngeal oedema<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Foreign body<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Tumour<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Vocal cord dysfunction<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Severe infection<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Stridor suggests obstruction of the upper or central airway.<\/span><\/p>\n<p><b>Cardiovascular Causes<\/b><\/p>\n<p><b>Heart Failure<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Left ventricular dysfunction increases pulmonary venous and capillary pressure, causing interstitial or alveolar pulmonary oedema.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Symptoms may include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Exertional dyspnea<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Orthopnea<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Paroxysmal nocturnal dyspnea<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Peripheral oedema<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Fatigue<\/span><\/li>\n<\/ul>\n<p><b>Acute Coronary Syndrome<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Myocardial ischaemia may present with dyspnea, with or without typical chest pain, particularly in older adults and people with diabetes.<\/span><\/p>\n<p><b>Cardiac Arrhythmias<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Rapid or slow arrhythmias can reduce cardiac output and produce palpitations, dizziness and breathlessness.<\/span><\/p>\n<p><b>Valvular Heart Disease<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Mitral stenosis, mitral regurgitation and aortic stenosis may cause pulmonary congestion or reduced systemic cardiac output.<\/span><\/p>\n<p><b>Pulmonary Hypertension<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Elevated pulmonary arterial pressure increases right ventricular workload and may cause progressive exertional dyspnea, fatigue, chest discomfort and syncope.<\/span><\/p>\n<p><b>Pericardial Tamponade<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Fluid accumulation under pressure within the pericardial sac restricts cardiac filling and may produce tachycardia, hypotension and dyspnea.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Other Causes<\/span><\/h2>\n<p><b>Anaemia<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Reduced haemoglobin concentration decreases the oxygen-carrying capacity of blood. Patients may develop exertional dyspnea, fatigue, pallor and tachycardia despite normal pulmonary function.<\/span><\/p>\n<p><b>Metabolic Acidosis<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Conditions such as diabetic ketoacidosis, renal failure and lactic acidosis stimulate deep, rapid breathing to reduce arterial carbon dioxide.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Kussmaul respiration is classically associated with severe metabolic acidosis.<\/span><\/p>\n<p><b>Neuromuscular Disease<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Disorders affecting the respiratory muscles may impair ventilation.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Examples include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Myasthenia gravis<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Guillain\u2013Barr\u00e9 syndrome<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Motor neuron disease<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Muscular dystrophy<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cervical spinal cord injury<\/span><\/li>\n<\/ul>\n<p><b>Obesity and Deconditioning<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Obesity increases the mechanical workload of breathing, while physical deconditioning causes early lactic acidosis and increased ventilatory demand during exercise.<\/span><\/p>\n<p><b>Anxiety and Panic Disorder<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Anxiety-related hyperventilation may cause breathlessness, chest tightness, dizziness, paraesthesia and a sensation of inability to inhale fully.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Psychological causes should be considered only after potentially serious cardiopulmonary disorders have been assessed.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Symptoms Associated with Dyspnea<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Dyspnea may be accompanied by:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Tachypnea<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Wheezing<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cough<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Sputum production<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Chest pain<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Palpitations<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Stridor<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Haemoptysis<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Fever<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cyanosis<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Orthopnea<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Peripheral oedema<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Fatigue<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Dizziness or syncope<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Use of accessory respiratory muscles<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Signs of severe respiratory compromise include inability to speak in complete sentences, altered consciousness, central cyanosis, silent chest, exhaustion and marked use of accessory muscles.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Diagnosis of Dyspnea<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Diagnosis requires identification of the underlying cause rather than confirmation of dyspnea itself.<\/span><\/p>\n<p><b>Medical History<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Important clinical details include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Onset and duration<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Sudden or gradual progression<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Symptoms at rest or during exertion<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Positional variation<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Chest pain<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cough, sputum or wheezing<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Fever<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Haemoptysis<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Leg swelling<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Recent surgery or immobilisation<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Smoking history<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Occupational exposure<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cardiac or pulmonary disease<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Medication use<\/span><\/li>\n<\/ul>\n<p><b>Physical Examination<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Assessment includes:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Respiratory rate<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Heart rate<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Blood pressure<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Temperature<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Oxygen saturation<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Mental status<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Work of breathing<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Chest expansion<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Breath sounds<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cardiac examination<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Jugular venous pressure<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Peripheral oedema<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Calf swelling<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pallor and cyanosis<\/span><\/li>\n<\/ul>\n<p><b>Pulse Oximetry and Arterial Blood Gas Analysis<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Pulse oximetry estimates peripheral oxygen saturation. Arterial blood gas analysis measures:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Partial pressure of oxygen<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Partial pressure of carbon dioxide<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Blood pH<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Bicarbonate concentration<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">It is particularly useful in severe dyspnea, respiratory failure and suspected acid-base disturbance.<\/span><\/p>\n<p><b>Chest Imaging<\/b><\/p>\n<p><span style=\"font-weight: 400;\">A chest radiograph may identify:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pneumonia<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pulmonary oedema<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pleural effusion<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pneumothorax<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cardiomegaly<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Computed tomography may provide further evaluation of interstitial disease, pulmonary embolism, malignancy or complex pleural pathology.<\/span><\/p>\n<p><b>Electrocardiography<\/b><\/p>\n<p><span style=\"font-weight: 400;\">ECG can detect:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Myocardial ischaemia<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Arrhythmias<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Right-heart strain<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pericardial disease<\/span><\/li>\n<\/ul>\n<p><b>Laboratory Investigations<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Depending on clinical suspicion, tests may include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Complete blood count<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Serum electrolytes<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Renal and liver function<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cardiac troponin<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">B-type natriuretic peptide<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">D-dimer<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Thyroid function tests<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Blood cultures<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Blood glucose and ketones<\/span><\/li>\n<\/ul>\n<p><b>Pulmonary Function Tests<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Spirometry evaluates airflow obstruction and bronchodilator reversibility.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Additional tests may include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Lung volumes<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Diffusing capacity for carbon monoxide<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Peak expiratory flow<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Bronchoprovocation testing<\/span><\/li>\n<\/ul>\n<p><b>Echocardiography<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Echocardiography assesses:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ventricular function<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Valvular disease<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pulmonary artery pressure<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pericardial effusion<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Structural cardiac abnormalities<\/span><\/li>\n<\/ul>\n<p><b>Exercise Testing<\/b><\/p>\n<p><span style=\"font-weight: 400;\">The six-minute walk test or cardiopulmonary exercise testing may help evaluate unexplained exertional dyspnea and distinguish cardiac, pulmonary and deconditioning-related limitations.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Treatment of Dyspnea<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Treatment is directed at the underlying disorder.<\/span><\/p>\n<p><b>Immediate Stabilisation<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Severe dyspnea requires assessment of:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Airway patency<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Breathing<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Circulation<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Oxygenation<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Mental status<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Oxygen therapy is indicated for documented hypoxaemia. Some patients may require non-invasive ventilation, endotracheal intubation or mechanical ventilation.<\/span><\/p>\n<p><b>Respiratory Treatments<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Depending on the cause, treatment may include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Inhaled bronchodilators for bronchospasm<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Inhaled or systemic corticosteroids for airway inflammation<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Antibiotics for bacterial infection<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Anticoagulation for pulmonary embolism<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pleural drainage for large effusion<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Needle decompression and chest-tube insertion for pneumothorax<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Disease-specific therapy for interstitial lung disease<\/span><\/li>\n<\/ul>\n<p><b>Cardiovascular Treatments<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Possible treatments include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Diuretics for pulmonary congestion<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Vasodilators<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Heart-failure therapy<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Antiarrhythmic treatment<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Coronary revascularisation<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Valve repair or replacement<\/span><\/li>\n<\/ul>\n<p><b>Correction of Systemic Causes<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Management may involve:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Blood transfusion or haematinic therapy for severe anaemia<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Insulin and fluid-electrolyte therapy for diabetic ketoacidosis<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Dialysis for selected cases of renal failure<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Treatment of neuromuscular disease<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Weight reduction and rehabilitation<\/span><\/li>\n<\/ul>\n<p><b>Pulmonary Rehabilitation<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Pulmonary rehabilitation combines:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Supervised exercise<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Breathing retraining<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Patient education<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Nutritional support<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Energy-conservation techniques<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">It can improve functional capacity and reduce breathlessness in chronic respiratory disease.<\/span><\/p>\n<p><b>Symptom-Directed Measures<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Breathing techniques such as pursed-lip breathing may reduce dynamic hyperinflation in obstructive lung disease. A cool airflow directed toward the face may reduce the perception of breathlessness in some patients.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Prevention<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Not every episode of dyspnea is preventable, but risk may be reduced through:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Smoking cessation<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Avoidance of occupational dust, fumes and allergens<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Appropriate vaccination<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Regular physical activity<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Weight management<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Control of asthma and COPD<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Adherence to cardiac medications<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Management of hypertension and diabetes<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Prevention of venous thromboembolism during high-risk periods<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Early treatment of respiratory infections<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Correction of nutritional deficiencies<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Regular monitoring of chronic cardiopulmonary disease<\/span><\/li>\n<\/ul>\n<p><b>When Is Dyspnea an Emergency?<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Immediate medical care is required when breathlessness is:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Sudden or rapidly progressive<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Present at rest<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Associated with chest pain<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Accompanied by cyanosis<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Associated with confusion or loss of consciousness<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Accompanied by severe wheezing or stridor<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Associated with haemoptysis<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Accompanied by unilateral leg swelling<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Associated with hypotension<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Occurring after allergen exposure<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Associated with inability to speak complete sentences<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Dyspnea is a subjective sensation of uncomfortable or difficult breathing caused by complex interactions among respiratory drive, pulmonary mechanics, gas exchange, cardiovascular function and sensory perception. Common aetiologies include asthma, COPD, pneumonia, pulmonary embolism, heart failure, anaemia, metabolic acidosis and neuromuscular disease.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Diagnosis requires systematic assessment of symptom onset, associated features, physical findings, oxygenation, cardiopulmonary function and relevant investigations. Management is directed toward the underlying disorder while supporting oxygenation and ventilation when necessary. Sudden or severe dyspnea, particularly when associated with chest pain, cyanosis, haemodynamic instability or altered consciousness, requires urgent medical evaluation.<\/span><\/p>\n<h3><span style=\"font-weight: 400; font-size: 18pt;\">Frequently Asked Questions<\/span><\/h3>\n<p><b>Are dyspnea and dyspnoea the same?<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Yes. \u201cDyspnea\u201d is the American spelling, while \u201cdyspnoea\u201d is the British spelling.<\/span><\/p>\n<p><b>Can dyspnea occur with normal oxygen saturation?<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Yes. Breathlessness may result from increased respiratory effort, hyperinflation, anaemia, cardiac dysfunction, anxiety or abnormal sensory processing even when oxygen saturation is normal.<\/span><\/p>\n<p><b>What is exertional dyspnea?<\/b><\/p>\n<p><span style=\"font-weight: 400;\">It is breathlessness that occurs during physical activity and improves with rest. It may indicate early cardiac, pulmonary, haematological or metabolic disease.<\/span><\/p>\n<p><b>Why does heart failure cause breathlessness?<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Elevated left-sided cardiac pressure causes pulmonary venous congestion and interstitial or alveolar fluid accumulation, reducing lung compliance and impairing gas exchange.<\/span><\/p>\n<p><b>Can anxiety cause severe breathlessness?<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Yes, anxiety and panic can produce marked dyspnea through hyperventilation and altered respiratory perception. However, serious cardiopulmonary causes must first be excluded.<\/span><\/p>\n<p><b>Which tests are used to diagnose dyspnea?<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Common investigations include pulse oximetry, ECG, chest radiography, blood tests, spirometry, echocardiography, arterial blood gas analysis and computed tomography.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dyspnea, also spelt dyspnoea, is the subjective sensation of difficult, [&hellip;]<\/p>\n","protected":false},"author":20,"featured_media":19275,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[31],"tags":[],"class_list":["post-19274","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Dyspnea (Dyspnoea): Causes, Symptoms, Diagnosis, Treatment and Prevention - 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