The pain on the left side of the stomach may be caused by gastrointestinal dysfunction, gastroenteritis, gastrointestinal tumors and other diseases, which can be relieved by general treatment, medication, surgery and so on. 1. General treatment: patients should pay attention to rest, avoid staying up late, overwork, mental stress, etc., quit smoking and drinking, and pay attention to diet, mainly light, easy to digest food, maintain balanced nutrition, and eat more fresh fruits and vegetables, fish, shrimp, eggs and so on. You can also apply hot compresses or massage on the abdomen to relieve the pain. 2. Medication: If the patient’s pain is severe, you can take scopolamine, atropine and other antispasmodic painkillers; if it is a gastric ulcer, chronic gastritis, etc., you can take omeprazole, ranitidine, bismuth potassium citrate and other drugs. If the gastroenteritis caused by dietary impurity, you can take amoxicillin, gentamicin, norfloxacin and other antibiotics for anti-infection treatment; if the gastrointestinal dysfunction, you can take pivotal ammonium bromide, loperamide and so on. 3. Surgery: If it is caused by gastrointestinal tumor and other diseases, surgery can be considered. If the patient has long-term or recurrent pain on the left side of the stomach, it is recommended to consult a doctor in time to find out the cause of the disease and carry out targeted treatment. Drugs should be taken strictly according to the doctor’s instructions, and should not be self-medicated to avoid delaying or even aggravating the condition.