Dry and bitter mouth may be caused by bad habits (such as smoking, drinking, etc.), or disease factors (such as reflux esophagitis, bile reflux, etc.), need to be specifically analyzed. 1. Bad habits: Smoking, drinking alcohol, staying up late and other bad habits can lead to dry and bitter mouth, need to quit smoking, limit alcohol, regular work and rest. 2. Disease factors: reflux esophagitis, bile reflux and other diseases can also appear in the mouth dry and bitter symptoms, can also be accompanied by acid reflux, heartburn, abdominal pain and other symptoms, gastroscopy and other tests can assist in a clear diagnosis. The cause of dry and bitter mouth may be caused by bad habits, may also be caused by certain diseases, it is recommended to consult a doctor in a timely manner, except for organic lesions, to avoid delays in the condition.