The causes of uterine pain during defecation are as follows: First, the most common is the uterus of a certain part of the inflammation and infection, when defecation will exert a certain amount of pressure on the abdomen and make the abdominal pressure rise temporarily, the uterus is located in the pelvic cavity and the abdomen is relatively close to the position, when hard to defecate, it will make the abdominal pressure to the pelvic cavity to stimulate the uterus of the inflammation, resulting in uterine pain. Second, the uterus has cysts or fibroids, when the uterus has cysts or fibroids, the uterus or enlarged uterus will be compressed when you are using force during bowel movement. Uterine tumors are very sensitive to the external stimuli, especially the pressure will stimulate the periosteum on the surface of the fibroids, and the periosteum will be pulled, which will make the nociceptive nerves excited and cause the women’s tummy ache.