Cough and bitter mouth may be caused by upper respiratory tract infection, reflux esophagitis, chronic pharyngitis and other reasons. 1. Upper respiratory tract infection: upper respiratory tract infection can have cough and other symptoms, while the virus invades the body and induces the hypothalamus thermoregulation point rises, body temperature rises, taste bud dysfunction, which can cause bitter mouth. 2. Reflux esophagitis: the lower esophageal sphincter and esophageal mucosal barrier dysfunction and other factors lead to gastric acid and other gastric contents through the esophagus reflux into the oral cavity, pharynx and other parts of the throat, stimulate the local mucosa and cause cough, bitter mouth and other symptoms. 3. Chronic pharyngitis: acute pharyngitis caused by repeated episodes of chronic pharyngitis, pharyngeal mucosa, lymphoid follicle hyperplasia and irritation caused by coughing, foreign body sensation, bitterness and other symptoms. Cough and bitter mouth may be related to a variety of factors, such as symptoms do not relieve or aggravate, it is recommended to consult a doctor for a clear diagnosis, under the guidance of the doctor standardized treatment.