Pain on the left side of the stomach is considered to be caused by digestive diseases such as chronic gastritis, intestinal stress syndrome, gynecological diseases such as dysmenorrhea, and urological diseases such as ureteral stones, etc. It is necessary to do further examination to clarify the cause of the disease, and then take the corresponding medication or surgical treatment. 1. Digestive system diseases: chronic gastritis, acute gastroenteritis, intestinal stress syndrome, etc. may cause left abdominal pain, accompanied by nausea, vomiting and other symptoms. You can take metronidazole, levofloxacin, norfloxacin and other anti-inflammatory drugs as prescribed by the doctor. 2. Gynecological diseases: If female patients show left lower abdominal pain, especially closely related to the menstrual cycle, gynecological diseases such as inflammation of the fallopian tube should be considered. It can be treated with antibiotics such as memantine and cephalosporin as prescribed by the doctor. 3. Urological diseases: ureteral inflammation or ureteral stones may also cause pain in the left lower abdomen, accompanied by urinary pain, urgency and other symptoms. Inflammation need to follow the doctor’s advice to use antibiotics to fight infection, stones can be through the phentolamine mesylate and other stone removal drugs or surgical removal of stones, the pain will also improve. If the left side of the stomach pain and long-term frequent attacks, it is recommended to go to the hospital for further examination and targeted treatment.