It is very important to know about lumbar discs for rehabilitation so that you do not fall into various misunderstandings in treatment. The lumbar region is one of the more flexible parts of the crestal movement, second only to the neck, and can be used for forward flexion, back extension, lateral bending, rotation and other activities, and also to bear a certain amount of weight, therefore, the lumbar soft tissues are under greater tension, the opportunity for injury is also more common in men and young adults. The disease can occur in people of any occupation, but most occur in heavy workers and athletes with high lumbar activity. Because of the complexity of the muscles and ligaments in the lumbar region, any tear or excessive strain can cause low back pain. The injury can involve muscles, ligaments, fascia, small intervertebral joints, sacroiliac joints or lumbosacral joints. Most acute lumbar sprains occur with a clear history of lumbar trauma, and are generally prone to occur in the following situations: 1. Suddenly starting lumbar loading exercises or bending or rotating exercises without preparation or inadequate preparation activities. 2.Improper posture of the lower back during labor or sports. 3.Improper back force during labor or exercise. 4.Improper and uncoordinated movements when lifting heavy objects or other labor and activities by two or more people. 5.Overload weight, over limit weight lifting, resulting in too much weight on the waist. 6.accidental injury cases such as fall from height, heavy object contusion, traffic accident, slip and fall on flat ground. The main manifestations of acute lumbar sprain are: 1, pain: usually immediately after the injury appears lower back pain, but sometimes the pain is not obvious at the time of injury, after a few hours or the next morning after feeling obvious pain. Pain is persistent, knife-like or tear-like, aggravated by activity, reduced after rest but not eliminated. The pain can be aggravated by coughing, loud talking, and abdominal exertion. Patients can mostly point to a more definite area of pain. The scope of local pressure pain is larger at first and then gradually limited. Patients tend to use their hands to support the waist to prevent more intense pain from occurring due to activities. 2. Stiffness of the lumbar region and limitation of movement: The damaged muscles reflexively cause spasm due to pain and other pathological factors, resulting in stiffness of the lumbar region and compensatory scoliosis of the crest (generally tilted to the affected side). All activities of the crest such as forward flexion, back extension, lateral bending, and rotation are limited due to increased pain. Muscles in spasm can aggravate the pain and make the muscles spasm again, forming a vicious circle. 3.Radiation and involvement neuralgia: Nearly half of the patients with acute lumbar sprain have radiation or involvement neuralgia, and the pain is mostly in the buttocks, posterior thigh, anterior medial thigh root and so on. The straight leg raise test can sometimes be positive, but the dorsal foot extension strengthening test is negative and can be differentiated from lumbar disc herniation. In addition, x-ray is required to exclude bony diseases.