Lumbar muscle strain is a series of symptoms such as low back pain caused by chronic, injurious lesions in the soft tissues of the lower back. It is one of the most common causes of chronic low back and leg pain. Pathogenesis: Long time forced position (bending, arching back) weight-bearing work, so that the lumbar muscles continue to be in a state of high tension. After a long period of time, it causes excessive tension force injury to the lumbar muscles and attachment points, so that the local soft tissues have an impaired blood supply, congestion, hypoxia and increased exudation and other inflammatory reactions, resulting in primary lumbar muscle strain, or because of improper treatment after acute lumbar sprain, the injured tissue is not completely repaired residual sequelae, or because of repeated minor injuries to muscle fascia adhesions, delayed and become chronic lumbago. The lumbosacral region has congenital deformities (such as lumbar sacralization, sacral lumbarization, occult spina bifida, hemivertebral body, etc.) and lumbar bone and joint pathological changes resulting in lumbar muscle strain. Secondly, the cold and wet environment and body weakness also predispose to disease. Clinical symptoms: Pain in the lumbar region, sometimes mild, sometimes severe, intermittent at first, then persistent, aggravated by exertion. Mostly vague soreness and swelling, with a wide range. The pain is related to labor, fatigue, and weather changes, and can be relieved by appropriate activities and aggravated by excessive activities, and aggravated by cold or rainy days. It is often difficult to work with bending, and the pain increases after bending for a long time, and in a few patients the pain increases late at night. Often like to pound the waist with their hands to relieve pain. On examination, the spinal activity is normal, sometimes there is mild lumbar muscle tension, and there are inaccurate pressure points in the lumbar region, often located at the lumbar back muscle stops. Diagnosis: 1. history of chronic low back pain, relieved by rest and rubbing, aggravated by exertion and bending work. 2. pressure points in the lumbar region, located at the starting and stopping points of the lumbar back muscles, such as the sacrospinous muscle and the posterior iliac crest. 3. no abnormalities on X-ray examination, or congenital malformations of the lumbosacral region may be found. Auxiliary examination: X-ray examination usually has no abnormal findings, but sometimes congenital malformations in the lumbosacral region can be found. Laboratory tests are negative for blood sedimentation, anti-chain “O” and rheumatoid factor, which can be differentiated from hyperplastic spondylitis and rheumatism. Treatment: There is no specific treatment for this disease, the eradication is more difficult, and easy to relapse. Therefore, the principle of treatment should emphasize comprehensive therapy, behavioral therapy, mobilization of the patient’s initiative to achieve the best results. 1, general therapy, eliminate the causes of the disease, prevention-oriented, “three parts of treatment and seven parts of nourishment” is the basic principle of treatment and relapse prevention; avoid strain, correct poor work posture, avoid cold and wet. 2, drug therapy 3.Closure therapy: 1% procaine or 1% lidocaine 5-10ml, plus prednisolone 25mg, local closure of painful spots. The drug must be accurately injected into the lesion, otherwise it is ineffective.4.Physical therapy.5.Acupuncture and massage therapy. Prevention: Eliminate the cause of the disease, prevention is the main focus. In patients with chronic strain injury, instruct lumbar muscle exercise, or surround the waist hard or wide belt to protect the waist. In severe cases, recurrent patients should be advised to transfer the type of work or change the posture of labor position.