03/12/2026
What are the "big three" causes of chronic cough?
Chronic cough, typically defined as lasting more than eight weeks, is most often linked to three conditions: postnasal drip, asthma, and gastroesophageal reflux disease (GERD). Mucus drainage can trigger the cough reflex, asthma may present primarily as cough even without wheezing, and reflux can irritate the airway when stomach acid reaches the throat. Identifying the underlying driver is key to choosing the right treatment approach.
Because similar symptoms can arise from very different mechanisms, careful evaluation of cough patterns and progression can provide important clinical insight — and help inform both patient management and respiratory research.
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Chronic cough is considered a lung disorder after eight weeks of persistent coughing. Contact Houston Methodist to learn more about the causes, symptoms, and treatment of chronic coughing. Find your pulmonologist at Houston Methodist.