Lumbar sprain usually refers to acute lumbar sprain when lifting heavy objects or improper posture. The essence is the disorder and misalignment of the small joints that cause the posterior branch of the lumbar nerve to become stuck, i.e., pressing on one of the nerve root outlets, causing restricted movement of the lumbar region. The pain is manifested as muscle pain on both sides of the lumbar region, which is aggravated by coughing and sneezing. There are also lumbar ligament injuries, including supraspinous, interspinous or lumbosacral joint ligament injuries, with fixed pain points that worsen with activity. In severe cases, there may be radiating pain in the lower extremities, requiring bed rest to obtain a certain degree of relief. How to determine acute lumbar sprain? If the lumbar region cannot be moved, sit on the edge of the bed and stretch the leg straight forward. If the leg can be straightened, it means there are no radicular symptoms and there is no problem to diagnose a lumbar sprain. The usual treatment, first of all, is bed rest for 3-5 days, after the tissue edema subsides, the small joints can be slowly reset, the symptoms of compression are relieved, and the symptoms of lumbar pain will also be relieved. In addition, if the pain is very serious and you cannot take care of yourself, you can go to the hospital to see a doctor for professional treatment.