Lumbar muscle strain may be caused by acute unhealed injury, chronic inflammatory reaction, congenital deformity of lumbar spine or acquired injury. 1. Acute injury is not healed: if the lumbar region has acute sprain will make the local muscle or ligament tissue damage, if the injury is not timely recovery or lumbar muscles often appear slight injury will cause chronic lumbar muscle strain. 2. Chronic inflammatory reaction: patients often carry things in the lumbar back or long-term work, long time bending will lead to lumbar ligament tissue or muscle damage caused by chronic inflammation. 3. Congenital deformity or acquired injury of lumbar vertebrae: patients with sacral spine lumbarization, lumbar spine sacralization, vertebral arch root fracture and other congenital deformities of the lumbar vertebrae, or acquired lumbar vertebrae injuries, such as lumbar intervertebral disc herniation, lumbar vertebrae compression fracture, etc. These may cause lumbar ligaments to become damaged. These may imbalance the ligaments or muscles of the lumbar region, and patients may develop chronic lumbar strain. Patients are advised to seek medical attention when symptoms such as lumbar pain occur, and the doctor will choose targeted treatment measures according to the condition.