The feeling of vague pain in the uterus may be caused by conditions such as pelvic inflammatory disease, pre-miscarriage and ectopic pregnancy. 1. Pelvic inflammatory disease: Pelvic inflammatory disease refers to inflammation of the upper reproductive tract or surrounding tissues. In addition to vague pain in the uterus, patients may also be accompanied by symptoms such as increased vaginal discharge. It can be treated with antimicrobial drugs as prescribed by the doctor, and surgery is needed if necessary. 2. Pre-eclampsia: For women who have had sex, a vague pain in the uterus may be a symptom of pre-eclampsia, and if it is accompanied by vaginal bleeding, it is recommended to go to the hospital in time. It needs to be treated with medication and, if necessary, surgery. 3. Ectopic pregnancy: If a woman who has had sexual intercourse has an ectopic pregnancy, it can also lead to a vague feeling of pain in the uterus. You need to go to the hospital for serum chorionic gonadotropin, gynecological ultrasound and other tests, and if necessary, you need to take medication or surgical treatment. Hidden pain in the uterus may also be caused by gastrointestinal or urinary tract diseases. If other symptoms occur, it is recommended to go to the hospital in time, complete the relevant examinations and take corresponding treatment programs.