One type of vague pain in the lower abdomen with brown discharge is due to normal physiological factors, such as ovulatory bleeding and late menstruation. The other is caused by certain gynecological diseases, such as pre-eclampsia, ectopic pregnancy, pelvic inflammatory disease, and endometriosis. Disease-induced vague pain in the lower abdomen with brown discharge requires prompt medical attention to clarify the cause. Common causes and related suggestions are as follows: 1. Physiological factors: 1. Ovulatory bleeding: Women will shed part of their endometrium during ovulation, causing a small amount of bleeding in the vagina, and at the same time, with the fluctuation of hormone levels will also lead to the feeling of vague pain in the lower abdomen. If the patient has no other discomfort and only appears during ovulation, you can observe a few more times, if it is more regular, it is mostly a physiological phenomenon, pay more attention to rest. 2, the end of menstruation: at the end of menstruation, the pain in the abdomen weakens and the amount of menstrual blood decreases, there will be vague pain in the lower abdomen with brown discharge, which is mostly a normal phenomenon. Pay attention to the timely replacement of sanitary napkins, to keep the local clean. Pathological factors: 1. Premature miscarriage: The main clinical manifestation of early miscarriage is vaginal bleeding and lower abdominal pain after menopause. Due to the stripping of the villi and meconium tissue, the blood sinus open bleeding can stimulate the uterus contraction, manifested as paroxysmal lower abdominal pain in the middle part, accompanied by blood outflow. If this manifestation occurs in pregnant women, they should go to the hospital in time to clarify the fetal development and take fetal preservation treatment if necessary; 2. Ectopic pregnancy: Ectopic pregnancy is a common acute abdominal condition in obstetrics and gynecology, with typical symptoms of abdominal pain and vaginal bleeding after menopause. Most of them have a history of menopause, but some of them do not have any obvious history of menopause. In the early stage, it often presents as vague pain in one side of the lower abdomen, sometimes with a small amount of bleeding, which may present as brown discharge. As the early symptoms are not obvious, it is easy to be overlooked. As the disease progresses, it is mostly diagnosed during the acute attack, when it is sent to the emergency room for resuscitation due to heavy bleeding from the lower body, severe abdominal pain and fainting shock. If diagnosed early, methotrexate can be injected locally to make the embryo die and fall off; if it evolves into acute abdomen, emergency surgery is needed; 3. Pelvic inflammatory diseases: pelvic inflammatory diseases can also trigger lower abdominal vague pain with brown discharge, commonly pelvic inflammatory disease, endometritis, hemorrhagic tubitis. In the treatment are based on antibiotic therapy, according to different pathogens, choose the appropriate antibiotics, such as ceftriaxone sodium, doxycycline, minocycline, levofloxacin and other drugs; 4, endometriosis: women with endometriosis can show vague pain in the lower abdomen before and after menstruation and brown vaginal discharge, and need to go to the hospital for gynecological ultrasound and other examinations to further assess the condition. In addition to the above common causes, lesions such as uterine fibroids, cervical polyps, endometrial cancer and cervical cancer can also cause vague pain in the lower abdomen with brown discharge, and there are many possible causes.