Lumbar muscle strain is a chronic injury inflammation of the lumbar muscle and its attachment point fascia, or even periosteum, and is a common cause of lumbar pain. Treatment measures] Because of the long duration of the disease, it is necessary to build up the confidence of patients. Physiotherapy can relieve the symptoms, and patients with local pressure points can be treated with prednisolone closure. Emphasis on insisting on lumbar back muscle exercise to enhance muscle strength and stabilize the spine. Etiology】 Frequent and repeated accumulative minor injuries (strain) can cause pathological changes such as congestion, edema, exudation, fibrous tissue proliferation and adhesions in muscle attachment points, periosteum, ligaments and other tissues, which stimulate and compress nerve endings leading to low back pain. After the lesion occurs, in order to reduce the activity of the lesion, some muscles are often in spasm, and persistent lumbar muscle spasm can also cause accumulative strain injury of soft tissues, thus aggravating the pathological changes of the tissue. Some occupations require work in a fixed position, which is also an important cause of strain injury. Acute soft tissue sprains may also turn into chronic strains if they do not recover completely. Clinical manifestations】 Most strain injuries have a chronic onset and no clear history of acute trauma; some patients have a history of heavy physical labor, strenuous exercise or trauma; some patients have poor posture or have worked bent over for a long time. The symptoms are sometimes mild and sometimes severe, usually improving after rest and worsening after exertion, and cannot sit and stand for long periods of time and must change position frequently. Some patients have different degrees of pressure pain at the interspinous, posterior superior iliac spine, sacroiliac or lumbosacral joints, and the second and third transverse processes of the lumbar vertebrae; some patients have extensive pressure pain or no fixed pressure pain points.