The stomach pain brought about by the side effects of taking medicines may be acute gastritis and gastric ulcer, chronic gastritis and other diseases, which can be given dietary regimen, omeprazole, thioglycollate and other medications. 1. Acute gastritis and gastric ulcer: antipyretic and analgesic drugs, antibiotics and other drugs may stimulate the gastric mucosa leading to acute gastric mucosal edema, congestion, erosion and even ulceration and the symptoms of gastric pain, mild stopping the drug can be recovered on their own, do not need special treatment. If the symptoms are more serious or ulcers should take omeprazole and other acid inhibitors and aluminum thioglycollate and other gastric mucosa protectants. 2. Chronic gastritis: the side effects of long-term medication may lead to chronic gastritis symptoms of stomach pain, you can take omeprazole, pantoprazole and other drugs to inhibit the secretion of gastric acid; you can also take aluminum thiosulfate, colloidal bismuth pectin and other drugs to repair the gastric mucosa. If there is a side effect of taking medication to bring the phenomenon of stomach pain, it is not recommended to take their own medication, it is recommended to go to the hospital to check the gastroscopy, pathology biopsy and other items under the guidance of the doctor treatment.