Hi and very pleased to help you The gastroesophageal reflux disease (Gerd) or the reflux of the contents of the stomach into the esophagus by malfunction of the cardia which closes the top of the stomach and normally prevents this reflux is the suspected diseases behind your chronic cough. Gerd complains of burning behind the sternum (heartburn) after the meal, as well as a nocturnal reflex cough testifying gastroesophageal reflux during sleep. This pain also occurs when ingesting very cold or very hot drinks.When Gerd is the cause of a chronic cough, clinical presentation is rarely characteristic of Gerd, and in 50-75% of cases there is no evidence of Gerd. Cough may be predominantly diurnal. However, the clinical profile makes it possible to suspect in more than 95% of the cases this cause of chronic cough. Patients have normal chest x-rays, are not smokers, are not exposed to irritants, are not treated with angiotensin-converting enzyme inhibitors (drug’s cough side effect), have methacholine-negative or ineffective anti-asthma therapy, absence of eosinophils in sputum and no posterior rhinorrhea. The diagnosis is based on the 24-hour ph-meter performed on an outpatient basis, or gastric fibroscopy by gasteoenterologist. Since the evaluation of your respiratory system does not demonstrate any cause of this chronic cough, I invite you to do a gastric fibroscopy or 24 hours ph-measuring by a gastroenterologist so that you can definitively treat your chronic coughs. best wishes