Brown leucorrhea with slight pain in the abdomen may be a pre-menstrual symptom, due to a small amount of endometrial shedding before menstruation, which leads to brown leucorrhea. The change in sex hormone levels in the body before menstruation leads to pelvic congestion in the abdomen, causing soreness and slight pain in the lower abdomen, which is a normal phenomenon. If it occurs during the menstrual cycle, it may be ovulatory bleeding, so you can observe and see. If it is accompanied by painful intercourse and bleeding during sex, resulting in brownish leucorrhea or slight pain in the abdomen, you should exclude discomfort caused by cervicitis, cervical erosion or cervical polyps. If there are abnormal results, colposcopy should be performed to see if there are precancerous lesions. If there are precancerous lesions, cervical LEEP or conization should be performed as soon as possible.