Cough causes and treatment
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Common Causes of Cough: Acute and Chronic Cough Etiologies
Cough is one of the most frequent reasons people visit healthcare providers and can be caused by a wide range of conditions. Acute cough, lasting up to three weeks, is most often due to viral upper respiratory tract infections, such as the common cold. Other causes of acute cough include bacterial infections and, less commonly, environmental irritants or heart failure Mukae2021Dicpinigaitis2015.
Chronic cough, defined as lasting more than eight weeks in adults (and more than four weeks in children), is most commonly caused by upper airway cough syndrome (previously called postnasal drip), asthma, gastroesophageal reflux disease (GERD), and nonasthmatic eosinophilic bronchitis. Other potential causes include chronic obstructive pulmonary disease (COPD), use of angiotensin-converting enzyme (ACE) inhibitors, tobacco use, environmental triggers, and obstructive sleep apnea. In children, chronic cough is often due to asthma, protracted bacterial bronchitis, or upper airway cough syndrome Michaudet2017Morice2004Mukae2021.
Diagnostic Approach to Cough: Evaluation and Assessment
A systematic approach is essential for diagnosing the cause of cough. For acute cough, a clinical evaluation is usually sufficient, with further testing reserved for cases with concerning features. For chronic cough, a stepwise evaluation is recommended, starting with a detailed history and physical examination, followed by targeted investigations such as spirometry, chest radiography, and, if indicated, computed tomography (CT) scans. Identifying and treating the underlying cause is key to successful management Michaudet2017Irwin2000Morice2004+1 MORE.
When sputum is present, additional tests like sputum smear, culture, cytology, and imaging may be needed to rule out infections, malignancy, or other lung diseases. In cases where the cause remains unclear, referral to a specialist may be necessary .
Treatment Strategies for Cough: Targeted and Symptomatic Approaches
The primary goal in treating cough is to address the underlying cause. For example, treating allergic rhinitis, asthma, or GERD can often resolve chronic cough. In cases where a specific cause cannot be identified or when cough persists despite treatment, symptomatic therapy may be considered Michaudet2017Irwin2000Morice2004+1 MORE.
Symptomatic treatments include antitussive medications, though their effectiveness is often limited and they may have undesirable side effects. Over-the-counter remedies and narcotic antitussives are generally not well supported by clinical evidence, especially for acute cough. Combination medications containing mucolytics (like bromhexine or guaifenesin) and bronchodilators (like salbutamol) can be helpful, particularly when cough is accompanied by thick sputum or bronchial obstruction Shakirova2024Bakhtiar2020Dicpinigaitis2011+1 MORE.
For chronic, refractory cough, newer therapies such as gabapentin, pregabalin, and speech therapy may be tried. There is also ongoing research into developing more effective and safer antitussive agents, especially for patients with unexplained or persistent cough Michaudet2017Zhang2025.
Challenges and Future Directions in Cough Management
Despite the high prevalence and impact of cough, there are still significant challenges in its management. Many available treatments for acute and chronic cough lack strong evidence of effectiveness or have side effects that limit their use. There is a need for better diagnostic tools, increased awareness among healthcare professionals, and the development of new, safe, and effective therapies for cough, particularly for chronic and refractory cases Dicpinigaitis2011Dicpinigaitis2015Zhang2025.
Conclusion
Cough is a common symptom with a broad range of causes, from self-limited viral infections to chronic respiratory or systemic diseases. Accurate diagnosis and targeted treatment of the underlying cause are essential for effective management. While symptomatic therapies can provide relief, especially when the cause is unclear or untreatable, there remains a need for improved diagnostic methods and more effective treatments, particularly for chronic and refractory cough.
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