Right lower abdominal pain with brown discharge can be caused by a variety of reasons, generally considered ovulation, preeclampsia, ectopic pregnancy, gynecological inflammatory diseases, gynecological tumors and other diseases caused. 1. Ovulation: women may experience mild abdominal pain with brown discharge during ovulation. 2. Pre-eclampsia: It can be manifested as abdominal pain accompanied by brown discharge or a small amount of vaginal bleeding. Most of the pregnancy can be continued after active fertility preservation treatment. 3. Ectopic pregnancy: belongs to the acute abdomen, in the early stage may appear a small amount of vaginal bleeding or brown discharge accompanied by abdominal pain, with the progress of the disease may appear severe pain, shock and other manifestations. 4. Gynecological inflammatory diseases: if a woman suffers from pelvic inflammatory disease, due to the factors of inflammation and infection, it can lead to pain in the right lower abdomen with vaginal discharge and other manifestations. 5. Gynecological tumor: when women suffer from endometrial cancer, cervical cancer, uterine fibroids and other diseases, lower right abdominal pain accompanied by brown secretion may appear, and clinical symptoms and performance of corresponding diseases may appear at the same time. If you have lower right abdominal pain with brown discharge, you need to go to the hospital for ultrasound and other related examinations to clearly diagnose the cause of the disease.