Bitter and nausea in the mouth may be related to indigestion, bile reflux and other diseases, which can be relieved by adjusting the diet and taking gastric medicine. 1. Adjust the diet: patients should develop good eating habits, eat more light and easy to digest food, avoid eating greasy, spicy, cold and other stimulating food, but also pay attention to small meals, do not eat too much at one time, to avoid aggravating the burden on the stomach and intestines, causing indigestion, so as to alleviate the symptoms of bitter and nausea in the mouth. 2. Take drugs: If there is still no relief after adjusting the dietary habits of bitter mouth and nausea, you can take drugs to treat gastric diseases, including drugs to promote gastrointestinal dynamics, such as domperidone, mosapride, etc., as well as neutralize the bile of the drug. If the patient has a long-term bitter mouth nausea, should go to the hospital, under the guidance of the doctor for treatment, not self-medication, so as not to delay the condition.