Stomach pain for a month, feel weight loss every day may be gastritis, gastric ulcer or gastric malignant tumors, etc., first of all, you should carry out gastroscopy, abdominal CT and other related examinations to clarify the cause of the disease before treatment. Need omeprazole, thioglycollate and other drugs to inhibit acid stomach, protect the gastric mucosa treatment or surgery, radiotherapy treatment, and keep a light diet. 1. Gastritis: inflammation of gastric mucosa caused by various reasons leads to stomach pain, loss of appetite, dyspepsia and weight loss, need to treat the cause, use omeprazole sodium enteric-coated tablets, aluminum sulfate and other drugs to inhibit acid and protect the stomach, but may cause shock, thrombocytopenia, skin rash and other adverse reactions, allergy is prohibited. 2. Gastric ulcer: various reasons lead to gastric acid secretion caused by excessive gastric mucosal damage to the gastrointestinal function, indigestion, stomach pain, with vomiting, weight loss, need to inhibit gastric acid secretion, such as omeprazole enteric-coated tablets, but may cause gastrointestinal reactions, skin rashes, etc., allergy is prohibited; at the same time the use of magnesium alumina carbonate chewable tablets to protect the gastric mucosa, but it may cause diarrhea, rash, etc., allergies, hypophosphatemia is prohibited. Disallowed. 3. Malignant tumor of stomach: bad dietary habits or bad environment and other causes of stomach mass appear stomach pain, loss of appetite, nausea, vomiting, blood in stool, etc., due to the growth of the tumor consume too much energy and nutrients and stomach function abnormality weight loss, need to be clearly diagnosed after surgical resection, and according to the postoperative situation to choose the treatment of chemotherapy and radiotherapy. If you have stomach pain for one month and feel weight loss every day, it is recommended to do gastroscopy, abdominal CT, blood glucose, thyroid function, tumor markers and other related examinations in time to make a clear diagnosis and then follow the doctor’s instructions for timely treatment.