Low back strength is often caused by the following reasons: 1. There may be muscle atrophy of the lumbar region. It is often seen in patients who are bedridden for a long time due to various reasons and are not able to move, and then there will be a situation of disuse muscle atrophy of the lumbar muscles. If the patient needs to suddenly go down to the ground to bear weight, it will be obvious that the lumbar weakness, and have lumbar pain, and at this time is very easy to produce lumbar sprain. 2, may exist lumbar muscle strain situation. The patient is often seen to have long-term sitting and standing, followed by long-term bilateral lumbar muscle pain, the patient will obviously feel the lumbar weakness and pain when doing activities involving the waist. 3, there may be osteoporosis. Patients suffering from severe osteoporosis will often show pain around the lumbar spine and will experience weakness in the lower back without obvious triggering factors. 4. It may be caused by degenerative changes in the lumbar spine, for example, when a lumbar disc herniation develops, it may cause a series of clinical symptoms such as pain and weakness in the lower back.