Acid in the mouth is considered gastritis, gastric ulcer caused by acidity, need to check the gastroscopy, liver function to clarify the diagnosis, treatment oral omeprazole, mosapride, gastritis granules, etc.. Pay attention to a light diet, avoid spicy, fried, irritating and cold food, avoid smoking and alcohol, avoid overeating and so on. The second consideration is food stagnation in the stomach and intestines, depression and heat caused by the stomach and intestines full of discomfort, abdominal pain, or diarrhea, mucous and sour in the mouth, etc., need to take oral stomach tablets, Baohe pill, Hawthorn pill, etc., a small amount of light diet.