What is the most common cause of chronic cough in adults?

The most common cause of chronic cough in adults is postnasal drip. This condition arises when excess mucus accumulates in the nasal passages and drips down the back of the throat, leading to irritation and the triggering of a cough reflex. Many adults may experience this due to allergies, sinus infections, or upper respiratory infections, which can result in prolonged coughing as the body attempts to clear the irritants.

Postnasal drip is often under-recognized and can easily be confused with other causes of chronic cough. The symptoms can mimic those of asthma or bronchitis, but the consistent irritation caused by mucus dripping down the throat is a key characteristic that differentiates it from other conditions.

While gastroesophageal reflux disease (GERD), asthma, and chronic bronchitis are all potential causes of chronic cough, postnasal drip is frequently cited in clinical practice as the most prevalent cause. In many cases, treating the underlying cause of postnasal drip, such as managing allergies or addressing sinus issues, can effectively alleviate the chronic cough associated with it. This highlights the importance of correctly identifying postnasal drip as a primary factor in the evaluation and management of chronic cough in adults.