Causes of dry cough
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Common Causes of Dry Cough
Dry cough, which is a cough without mucus or phlegm, is a frequent symptom seen in both general and specialist medical practice. The most common causes in adults include upper airway cough syndrome (often due to post-nasal drip or rhinosinusitis), asthma (including cough variant asthma), and gastroesophageal reflux disease (GERD) 1235+2 MORE. Post-viral cough is also a frequent cause, especially following respiratory infections 134. In some cases, medications such as angiotensin-converting enzyme (ACE) inhibitors can trigger a persistent dry cough .
Less Common and Rare Causes of Dry Cough
Dry cough can also be a symptom of more serious or less common conditions. These include chronic respiratory diseases like chronic obstructive pulmonary disease (COPD), chronic bronchitis, bronchiectasis, pulmonary tuberculosis, and even lung tumors 34. In children, rare causes such as hypersensitive pneumonitis should be considered, especially when the cough is lingering and other common causes have been ruled out . Cardiovascular issues and foreign body aspiration are additional, though less frequent, contributors .
Inflammatory and Immune-Related Mechanisms
Some patients with chronic dry cough, especially those without asthma or bronchiectasis, show signs of airway inflammation. Increased neutrophils and higher levels of cytokines like TNF-α and IL-8 have been found in the airways of these patients, suggesting that inflammation plays a role in the development of dry cough . In certain women, particularly around menopause, a specific type of airway inflammation involving activated CD4+ lymphocytes has been identified, even when no other cause is found .
Diagnostic Challenges and Idiopathic Cases
Despite thorough evaluation, a significant number of patients with persistent dry cough do not have an identifiable cause. These cases are often labeled as idiopathic, and the cough may be related to an increased sensitivity of the cough reflex 168. This makes diagnosis and management particularly challenging.
Conclusion
Dry cough is a common symptom with a wide range of possible causes, from common conditions like post-nasal drip, asthma, and GERD, to less frequent causes such as medication side effects, chronic lung diseases, and rare immune-related conditions. Inflammation and heightened cough reflex sensitivity are often involved, especially in chronic or unexplained cases. Accurate diagnosis is essential for effective treatment, but in some patients, the cause remains elusive, highlighting the need for further research and improved management strategies 1234+6 MORE.
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