Girls with anal pain caused by a small stomach, may include the following aspects: 1, girls with dysmenorrhea, and the menstrual cycle has a close relationship with the menstrual cycle, will be in the middle of a fixed menstrual cycle of a small stomach, pain in patients with severe may be connected with the anus. 2, perianal abscess is more serious, the perianal abscess pain range will be accumulated to the patient’s abdomen. 3, the inflammatory disease of the female pelvic. Pain without obvious regularity will stimulate the rectum causing constipation or diarrhea.4, may be caused by ectopic pregnancy, anal pain is caused by bleeding on the rectum caused by irritation.5, may be due to hemorrhoids caused by the impact of the local inflammatory response to aggravate the patient may also cause pain in the small stomach. Appear similar situation, medical history, auxiliary examination is very important, it is recommended that patients must be careful not to delay the condition.