The brown leucorrhea and pain in the lower abdomen during ovulation may be caused by the following reasons: First, the estrogen and progesterone in the body will fall during ovulation, resulting in the shedding of the endometrium and causing bleeding, the amount of bleeding is often relatively small, very few people will have stomach pain, the vast majority will not lead to pain in the stomach symptoms. Secondly, patients who have suffered from pelvic inflammatory disease or endometrial inflammation may have pain in the lower abdomen and brown discharge, mainly because the inflammatory tissue is relatively brittle, causing the endometrium to shed and cause bleeding. It is recommended to go to the hospital for examination and treatment as soon as possible.