Low back pain once menstruation comes is because during menstruation there is congestion in the pelvis and uterus, which can easily lead to symptoms such as low back pain and backache. The increased secretion of prostaglandins in the body during menstruation can easily cause uterine contractions, which can also lead to symptoms such as back pain. Anterior flexion and posterior tilt of the uterus in a bad position will also cause back pain during menstruation, as well as uterine prolapse, uterine fibroids, ovarian cysts, etc. pressing the nerves in the pelvic cavity leading to back discomfort. Infiltration of malignant tumor cancer cells in the pelvis can easily cause damage to the tissues in the pelvis causing back pain. Sexual life without moderation and frequent abortion can easily cause physical weakness and kidney deficiency, which will also cause lumbago and back pain. After abortion, not paying attention to hygiene, premature coitus is easy to cause pelvic inflammation, inflammation stimulation will cause lumbar discomfort. If there is lumbar muscle strain and other conditions will also appear back pain. It is best to go to the hospital in time for examination and reasonable treatment according to the specific situation.