Physiological back pain may be related to the following reasons: 1. It may be caused by a series of inflammatory reactions. During the physiological period, a series of inflammatory mediators are produced inside the body. This may cause inflammation around the pelvic area, which may stimulate the nerves in the lumbar area and produce back pain. 2. This condition may be caused by concurrent infections of the gynecological system. This is the first time I’ve ever seen a woman with a low back pain. During the physiological period, the patient’s own resistance is relatively weak, if the waist, sacrococcygeal area has cold, it is very easy to cause muscle spasm or inflammation of the fascia, and then lead to lumbago. During the physiological period, due to the discharge of large amount of menstrual blood, it will cause deficiency of essence and blood, and the belt vein will not be fixed. The Belt Vessel is a meridian located in our lumbar region. At this time it can lead to lumbar pain due to lesions of such meridians.