Women always have low back pain may be due to pelvic inflammatory disease, may be due to lumbar muscle strain, and may be due to premenstrual syndrome. 1. Pelvic inflammatory disease: Pelvic inflammatory disease is a general term for endometritis, salpingitis, tubo-ovarian abscess and pelvic peritonitis. Pelvic inflammatory disease can also lead to symptoms of low back pain in female patients, in addition to lower abdominal pain, increase in vaginal secretions, abnormal vaginal bleeding and other symptoms. 2. Lumbar muscle strain: lumbar muscle strain is a kind of lumbar muscle and its attachment point fascia or periosteum of chronic injury inflammatory disease, the disease can also lead to female patients always appear lumbago symptoms, this pain can be aggravated after daytime labor, and alleviated after rest. 3. Premenstrual syndrome: premenstrual syndrome can lead to female patients always have the symptom of lumbago, the appearance and disappearance of this symptom is related to the menstrual cycle, often 1~2 weeks before menstruation, after the onset of menstruation can be quickly reduced or disappear. In addition to the above factors, other reasons can also cause female patients to always have symptoms of back pain, it is recommended to consult a doctor in time to find out the cause and ask the doctor to deal with it.