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Chronic Cough – Causes, Diagnosis and Treatment
Chronic cough is defined as a cough lasting more than eight weeks. It is a common symptom with many possible causes and should always be evaluated by a doctor.
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Chronic cough is defined as a cough lasting more than eight weeks. It is a common symptom with many possible causes and should always be evaluated by a doctor.
What Is Chronic Cough?
Chronic cough is defined as a cough that persists for more than eight weeks in adults. In children, the threshold is four weeks. It is one of the most frequent reasons people visit a doctor and can significantly affect quality of life. Chronic cough is not a disease in itself but rather a symptom pointing to an underlying condition that requires proper diagnosis and treatment.
Causes
The most common causes of chronic cough in non-smokers include:
- Upper airway cough syndrome (UACS) / Postnasal drip: Mucus dripping from the nose or sinuses into the throat, often caused by allergic or chronic rhinitis.
- Asthma: A chronic inflammatory airway disease that can cause cough, wheezing, and shortness of breath.
- Gastroesophageal reflux disease (GERD): Stomach acid rising into the esophagus and airways can trigger persistent coughing.
- ACE inhibitors: These blood pressure medications cause a dry, persistent cough in up to 15% of patients as a side effect.
- Chronic obstructive pulmonary disease (COPD): Particularly common in smokers, accompanied by phlegm and breathlessness.
- Non-asthmatic eosinophilic bronchitis: Airway inflammation without obstruction.
Less common but serious causes include lung cancer, tuberculosis, heart failure, and bronchiectasis.
Symptoms and Associated Features
Chronic cough can be dry or productive (with phlegm). Associated symptoms help narrow down the cause:
- Colored or thick mucus may indicate infection or COPD
- Heartburn and acid regurgitation suggest GERD
- Nighttime cough and breathlessness may point to asthma
- Coughing up blood (hemoptysis) requires immediate medical attention
- Unexplained weight loss and night sweats may indicate tuberculosis or malignancy
Diagnosis
Diagnosis begins with a thorough medical history and physical examination. Common diagnostic tools include:
- Spirometry (lung function test): To detect asthma or COPD
- Chest X-ray or CT scan: To rule out structural lung disease
- ENT examination: Assessment of the nose, sinuses, and throat
- 24-hour pH monitoring: To detect acid reflux
- Bronchoscopy: If a foreign body or malignancy is suspected
- Allergy testing: If an allergic cause is suspected
Treatment
Treatment is directed at the underlying cause:
- Upper airway cough syndrome: Nasal corticosteroids, antihistamines, saline nasal irrigation
- Asthma: Inhaled corticosteroids, bronchodilators
- GERD: Proton pump inhibitors, dietary changes, weight loss
- ACE inhibitor-induced cough: Switching to an angiotensin receptor blocker (ARB/sartan)
- COPD: Bronchodilators, smoking cessation, respiratory physiotherapy
In cases where no clear cause is identified or cough persists despite treatment, a multidisciplinary evaluation may be necessary. Neuromodulatory therapies or cough suppressants may be considered in selected cases.
When to See a Doctor
You should always seek medical advice if your cough lasts more than eight weeks, is accompanied by blood in the sputum, causes significant breathlessness, or is associated with unexplained weight loss or persistent fever.
References
- Irwin RS, French CL, Chang AB, Altman KW. Classification of Cough as a Symptom in Adults and Management Algorithms. Chest. 2018;153(1):196-209.
- Morice AH et al. ERS guidelines on the diagnosis and treatment of chronic cough in adults and children. European Respiratory Journal. 2020;55(1):1901136.
- Gibson P, Wang G, McGarvey L et al. Treatment of Unexplained Chronic Cough. Chest. 2016;149(1):27-44.
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