Pain in the anus attached to the tummy should be considered a symptom caused by pelvic fluid, because the rectal recess of the uterus is the lowest in the entire pelvic cavity in women. If there is fluid in this area, it will cause anal pain and a feeling of swelling in the anus. If this condition is accompanied by endometrial inflammation, women will have pain in the belly, so this clinical manifestation is often a symptom of pelvic inflammatory disease. In addition, the rupture of ovarian cysts in women with ovarian cysts can also cause such symptoms, because after the rupture of ovarian cysts, the fluid of the cysts will flow into the rectal recesses of the uterus of women and cause anal swelling, and the rupture of ovarian cysts will result in pain in the small stomach.