If your stomach hurts and your leukorrhea is brown, it is often due to pelvic inflammatory disease. It is best to do a gynecological examination to find out if there are any abnormalities in the vagina and cervix, and a gynecological duplex examination to find out the size of the uterus and if there is any pressure in the adnexal area. It is best to do an ultrasound to find out if there are any abnormal echogenic masses in the endometrium and to find out the thickness of the endometrium. Pelvic fluid buildup, combined with bilateral adnexal tenderness and uterine tenderness, is often considered to be the result of chronic pelvic inflammatory disease (PID). It is best to treat this condition with broad-spectrum antibiotics combined with metronidazole for anaerobic bacteria, which can be taken orally for a week, and no sexual intercourse is allowed during treatment. In addition, it is also recommended to rule out the possibility of pregnancy, so you need to draw blood to check blood HCG.