Persistent dry cough causes
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Common Causes of Persistent Dry Cough
Persistent dry cough is a frequent complaint in both general and specialist medical practice. The most common causes include post-viral cough, asthma (including cough variant asthma), upper airway cough syndrome (previously called postnasal drip or rhinosinusitis), and gastroesophageal reflux disease (GERD) 1234+2 MORE. These conditions can occur alone or in combination, and are responsible for the majority of chronic dry cough cases in adults 1234+2 MORE.
Medication-Induced Dry Cough
Certain medications are well-known to cause persistent dry cough. Angiotensin-converting enzyme (ACE) inhibitors are a common culprit, with cough occurring in 5–35% of patients taking these drugs. The cough can start soon after beginning the medication or even months later, and usually resolves within weeks after stopping the drug 1210. Less commonly, other medications such as omeprazole have also been reported to cause chronic dry cough, although this is rare and not widely recognized .
Less Common and Unusual Causes
While the majority of cases are due to the conditions listed above, persistent dry cough can also be a symptom of other diseases. These include respiratory infections (such as tuberculosis), malignancy (lung tumors), chronic obstructive pulmonary disease (COPD), chronic bronchitis, bronchiectasis, drug-induced lung injury, heart failure, and allergic reactions 67. In rare cases, a foreign body in the airway or cardiovascular problems may also present with a dry cough .
Idiopathic Persistent Dry Cough and Cough Reflex Sensitivity
In some patients, no clear cause for the cough can be found even after thorough investigation. These cases are termed idiopathic persistent dry cough. Research suggests that these patients often have an increased sensitivity of the cough reflex, possibly due to heightened sensitivity of airway sensory nerves 1234+1 MORE. This makes treatment challenging, as standard therapies may not be effective.
Diagnostic Approach and Management
A systematic diagnostic approach is essential to identify the underlying cause of persistent dry cough. This typically involves a detailed history, physical examination, and targeted investigations such as spirometry, chest imaging, and sometimes specialist referral 1245+1 MORE. Treating the underlying cause usually leads to improvement or resolution of the cough. In cases where no cause is found, symptomatic relief may be considered, but current antitussive medications have limitations and may cause side effects such as sedation or addiction 123.
Conclusion
Persistent dry cough is most often caused by asthma, upper airway cough syndrome, GERD, or medication side effects, especially ACE inhibitors. Less common causes include infections, malignancy, and other respiratory or cardiovascular diseases. In some cases, no cause is found, and increased cough reflex sensitivity may be involved. Accurate diagnosis and targeted treatment are key, but management can be challenging when the cause remains unclear.
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