The pain on the right side of the small stomach is called paroxysmal pain, which is most commonly caused by the following: 1. intestinal diseases, such as intestinal spasm, gastrointestinal tract dysfunction, but pay special attention to appendicitis, especially acute appendicitis, which is usually accompanied by pressure pain and rebound pain in the place of the appendiceal mets point, in addition to pain. 2. urinary tract diseases, such as urinary tract The pain is sudden and intense, like colic, with cold sweat, pale face and even vomiting, accompanied by percussion pain in the kidney area or dark urine or even hematuria when urinating. 3. The pain in the right lower abdomen can also occur with pelvic inflammatory disease, such as ectopic pregnancy, ovarian cyst torsion or rupture of the corpus luteum of the ovary.