The left side of the stomach pain is considered to be caused by chronic gastritis or gastric ulcer, duodenal ulcer, it is recommended to go to the gastroenterology department of the hospital in time to cooperate with the doctor to do gastroscopy, to confirm the diagnosis of chronic gastritis or gastric ulcer, after the diagnosis under the guidance of the doctor to take drugs to repair the gastric mucosa, such as omeprazole, antibiotics such as amoxicillin. The actual fact is that you should have a regular resting habit, avoid straining and staying up late, eat regularly and quantitatively, avoid overeating, pay attention to eating more light, easily digestible, vitamin-rich foods that nourish the stomach, avoid spicy and stimulating, cold, hard and greasy, fried foods, pay attention to keep your mood relaxed, relaxed spirit, avoid anxiety and worry, and adhere to a moderate amount of physical activity every day to help digestion.