There are many causes of pain on the right side of the stomach, usually acute appendicitis, acute pelvic inflammatory disease, or colon disease, Crohn’s disease, etc. are considered. If the pain is acute and severe, acute appendicitis, ruptured ectopic pregnancy, acute intestinal torsion, ovarian torsion, gastric or duodenal ulcer, acute pelvic inflammatory disease, etc. are usually considered. If the pain on the right side of the stomach is frequent and persistent, it is considered to be associated with colon cancer, Crohn’s disease, right ureteral stone, tuberculous peritonitis, chronic intestinal torsion, functional dyspepsia. If the pain on the right side of the stomach is accompanied by fever and chills, it is considered to be abdominal abscess and infections outside the abdominal cavity; if it is accompanied by shock, it is considered to be intestinal perforation and strangulated intestinal obstruction; if it is accompanied by diarrhea, it is considered to be intestinal inflammation or digestive and absorption disorders. If the pain is difficult to be relieved, or other discomforts occur, medical treatment should be sought promptly.