Pain on the right side of the stomach may be caused by physiological factors, or appendicitis, liver and gallbladder diseases and other pathologic factors that produce pain. 1. Physiological factors, such as excessive alcohol consumption, long-term late-night fatigue, etc. may appear in the right side of the stomach pain, occasional mild pain, can not be treated, pay attention to more rest. Women before and after menstruation, uterine smooth muscle spasms, may also appear on the right side of the stomach pain, is a common physiological phenomenon. 2. appendicitis: inflammation stimulates the nerves will appear metastatic right lower abdominal pain, the pain site is mainly in the right lower abdominal Mai’s point. Mai’s point is the middle and outer third of the line between the navel and the right anterior superior iliac spine. There may be nausea, vomiting and other manifestations. 3. Liver and gallbladder diseases: liver abscess, cholecystitis and other diseases inflammation stimulates the nerves, there will also be the right side of the stomach pain, mainly in the right upper abdominal pain, eating greasy may aggravate the pain. In addition, the right side of the stomach pain may also be the right side of the kidney and ureteral stones, women may be the right side of the ovarian cysts, pelvic effusion, men may be prostatitis and so on. If you have right side stomach pain, you must go to the hospital for examination to identify the cause of the disease and treat it under the guidance of the doctor.