Majid Ali, M.D. Chronic Cough – Think Mold Allergy, Please!     Clinical Pearls 1.  Chronic cough is generally defined as cough that persists for more than 8 weeks. 2. It is common and often disabling. 3. As for its cause, I think of the big three: A. Mold allergy B. GERD-gastritis complex C. COPD, Asthma, Bronchiectasis, chronic bronchitis