Sudden lumbar pain is due to sudden changes in condition for more reasons, as follows: 1. sudden lumbar sprain leading to muscle and ligament damage; 2. small joint disorder, sudden jamming of nerves, leading to sudden lumbar pain; 3. sudden lumbar pain caused by acute attack of chronic lumbar pain; 4. compression fracture or sudden change in condition causing lumbar pain, etc. Sudden low back pain needs to be diagnosed and treated in a specialized department of a regular hospital to eliminate the symptoms and achieve the purpose of treatment. If you have never had low back pain and have sudden pain, you may need to go to the emergency room for treatment, and later to the relevant department, such as orthopedics and other specialized departments, for a clear diagnosis. If you usually have chronic low back pain and it suddenly worsens or your lumbar muscle hurts, you can go to the pain department for diagnosis and appropriate treatment.