Common causes of chronic cough are side effects due to commonly used drugs (especially angiotensin converting enzyme [ACE] inhibitors), tracheo-broncomalacia, chronic obstructive pulmonary disease (COPD), bronchiectasis, asthma, obstructive sleep apnea, rhinosinusitis, and GERD [9,10,13]. The gene discussed is ACE; the disease is obstructive sleep apnea syndrome.