There are any number of reasons for why you may have a chronic cough, from a respiratory tract infection to bronchitis. But often, a chronic cough is a symptom of heartburn and gastroesophageal reflux disease (GERD). It's not just a persistent cough, though -- heartburn frequently occurs in conjunction with symptoms of asthma, such as wheezing. Of course, you may not have the chest pain that accompanies heartburn, so you may not think that you're actually seeing a doctor for heartburn until you get the diagnosis. Since the constant coughing can do damage to the esophagus, it's important to seek treatment so that permanent harm isn't done.