When you have back pain after menstruation, you should generally consider dysmenorrhea and gynecological inflammation. During menstruation, due to the natural drop of body temperature, the stagnant blood in the uterus accumulates in the uterus, so it is easy to cause symptoms of dysmenorrhea such as abdominal pain, abdominal distension and lumbar bottom pain. It is necessary to pay attention to prevent cold and keep warm, wear more clothes, appropriate abdominal massage, use warming paste, accelerate local blood circulation, promote the discharge of stagnant blood from the uterus and relieve pain. Take more rest, drink more warm water, brown sugar water and avoid heavy physical work. Common gynecological inflammatory diseases such as pelvic inflammatory disease, endometritis, can affect the body’s hormone secretion, resulting in incomplete shedding of the endometrium and a feeling of anal swelling, which can easily cause pain. The use of antibiotics as well as gynecological anti-inflammatory drugs should be used under the guidance of a doctor.