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Shortness of Breath: Causes, Symptoms & Treatment

Shortness of breath (dyspnea) is the feeling of not getting enough air. It can indicate conditions affecting the lungs, heart, or other organ systems.

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Things worth knowing about "Shortness of Breath"

Shortness of breath (dyspnea) is the feeling of not getting enough air. It can indicate conditions affecting the lungs, heart, or other organ systems.

What Is Shortness of Breath?

Shortness of breath, medically known as dyspnea, refers to the subjective sensation of difficult or inadequate breathing. People affected may describe it as air hunger, tightness in the chest, or the feeling of being unable to take a deep breath. Shortness of breath is not a disease in itself but a symptom that can point to a wide range of underlying conditions. It may develop suddenly (acute) or gradually over time (chronic) and can range from mild to life-threatening.

Causes

The causes of shortness of breath are diverse and most commonly involve the cardiovascular or respiratory systems, though other organ systems may also be implicated:

Lung conditions: Asthma, chronic obstructive pulmonary disease (COPD), pulmonary embolism, pneumonia, pleural effusion
Heart conditions: Heart failure, cardiac arrhythmias, heart attack (myocardial infarction), pericarditis
Airway obstruction: Foreign body, severe allergic reactions (anaphylaxis), laryngeal edema
Anemia: Low red blood cell count reduces oxygen transport in the blood
Psychological causes: Panic attacks, anxiety disorders, hyperventilation syndrome
Other causes: Obesity, pregnancy, hyperthyroidism, neuromuscular diseases

Symptoms and Associated Signs

Shortness of breath rarely occurs in isolation. Depending on the underlying cause, the following associated symptoms may be present:

Cough, wheezing
Chest pain or tightness
Bluish discoloration of lips or fingernails (cyanosis)
Rapid or irregular heartbeat (palpitations)
Dizziness, light-headedness, or fainting
Swollen legs or ankles (a sign of heart failure)
Fever (suggesting infection)

Diagnosis

Evaluating shortness of breath requires a thorough medical history and physical examination. Common diagnostic tools include:

Physical examination: Auscultation of lungs and heart, oxygen saturation measurement via pulse oximetry
Blood tests: Complete blood count, D-dimer, troponin, arterial blood gas analysis
Imaging: Chest X-ray, CT scan of the lungs, echocardiography
Pulmonary function tests: Spirometry to assess breathing capacity
ECG: Assessment of heart function and detection of arrhythmias

Treatment

Treatment depends on the underlying cause of the shortness of breath. General and specific approaches include:

General Measures

Upright positioning (elevating the upper body) to ease breathing
Supplemental oxygen for low blood oxygen levels
Calming the patient, especially in psychologically driven cases

Specific Treatments

For asthma and COPD: Bronchodilators (e.g., salbutamol), corticosteroids
For heart failure: Diuretics, ACE inhibitors, cardiac glycosides
For pulmonary embolism: Anticoagulation therapy, thrombolysis in severe cases
For anemia: Iron supplementation or blood transfusions
For psychogenic dyspnea: Breathing exercises, psychotherapeutic support

When to Seek Medical Help

Sudden, severe shortness of breath is always a medical emergency — call emergency services immediately (911 or your local emergency number). Persistent or worsening shortness of breath without a clear cause should also be evaluated by a doctor as soon as possible.

References

World Health Organization (WHO): Chronic respiratory diseases. https://www.who.int/news-room/fact-sheets/detail/chronic-obstructive-pulmonary-disease-(copd) (accessed 2024)
Global Initiative for Chronic Obstructive Lung Disease (GOLD): Global Strategy for the Diagnosis, Management and Prevention of COPD. 2023 Report. https://goldcopd.org
Kasper DL et al.: Harrison's Principles of Internal Medicine, 21st edition. McGraw-Hill Education, 2022.

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