Bitter mouth after drinking alcohol may be caused by abnormal taste, indigestion and bile reflux. 1. Abnormal sense of taste: If the concentration of alcohol is high, it is easy to burn the oral mucosa, especially the mucosa on the tongue, so there is an abnormal sense of taste, which is manifested as a bitter mouth. 2. Indigestion: drinking alcohol on the stomach and intestines have a certain degree of stimulation, long-term drinking on the stomach and intestines stimulation prone to gastritis and other diseases. Especially when there is serious inflammation in the stomach and intestines, indigestion usually occurs after drinking alcohol, which can easily cause bitter taste. 3. Bile reflux: If you experience symptoms of vomiting after drinking alcohol, it is possible that the bile reflux into the mouth caused by the bitter mouth. If you have a bitter mouth after drinking alcohol, and if it continues to be unrelieved, it is recommended that you go to the hospital in time to complete the relevant examinations, and identify the cause of the disease and treatment under the guidance of the doctor.