The normal uterus is located in a woman’s pelvic cavity, and vague pain in the lower abdomen is not necessarily the part of the uterus. Reasons for women to have vague pain in the lower abdomen: 1, when suffering from chronic cystitis, bladder stones and other diseases, there may be symptoms of vague pain in the lower abdomen, often accompanied by frequent urination, urinary urgency, urinary pain; 2, suffering from pelvic inflammatory diseases, will cause vague pain in the lower abdomen, often accompanied by lumbosacral vague pain, as well as abnormal vaginal secretion; 3, suffering from uterine fibroids, endometriosis and other diseases, resulting in an increase in the size of the uterus, can also cause symptoms of the lower abdomen and lumbosacral; 4, suffering from uterine fibroids, endometriosis and other diseases, can also cause symptoms of the uterus. The increase in the size of the uterus will also cause vague pain in the lower abdomen and lumbar-sacral area; 4. Women who have normal sex life should also consider the possibility of pregnancy if such symptoms occur when menstruation does not come.