Soreness and swelling in the lower back in women can be caused by overworking the muscles of the lower back. Prolonged stooping, sitting or standing, as well as excessive lifting and carrying of heavy objects, may cause minor injuries to the lumbar fascia and muscles. And excessive muscle contraction, so that the local production of excessive lactic acid, which is able to produce soft tissue inflammation of the harmful metabolites, once the local lactic acid excess, the local muscle will appear obvious symptoms of soreness, and there may be pain and limited mobility performance. It can also be caused by lumbar disc bulging, which is a structural change disease of the lumbar spine. The lumbar intervertebral disc, because of excessive pressure, makes the fibrocartilage on the outside of the disc appear to swell, and the whole will irritate the surrounding soft tissues, so that the lumbar region occurs soreness and discomfort symptoms.