Physiologic pelvic effusion usually does not occur pain, pathological pelvic effusion may have pain symptoms in the lower abdomen and lumbosacral region. 1. Physiologic pelvic effusion: some women are formed during menstruation or ovulation when the follicular fluid flows into the pelvis from the follicles, with no obvious abdominal pain, abdominal distension and other abnormal manifestations. Physiologic pelvic fluid will disappear on its own after the next menstrual period and usually does not require special treatment. 2. Pathological pelvic effusion: Pathological pelvic effusion in women is usually caused by pelvic inflammation, ectopic pregnancy or rupture of corpus luteum, pelvic malignant tumors, etc., which can cause pain in the lower abdomen and lumbosacral pain. In the clinic, women who have pelvic fluid need to go to the hospital in time, so that the doctor can make a clear diagnosis and standardize the treatment.