Back pain after squatting for a long time may be caused by a herniated disk, lumbar muscle strain or muscle strain. It may also be the body’s normal reaction. 1. Lumbar disc herniation: If you suffer from lumbar disc herniation may have compression on the surrounding tissues, squatting for a long time will induce pain, aggravate the symptoms of compression, resulting in back pain. 2. Lumbar muscle strain: If the squatting time is long lumbar muscle in a state of long-term tension will cause lumbar muscle strain, but also may be due to the existence of lumbar muscle strain, squatting posture will also induce lumbar pain, time may cause secondary injury caused by lumbar pain. 3. Muscle strain: If the squatting posture is not correct, it may lead to lumbar muscle strain, causing back pain. Squatting for a long time back pain may also may be the body’s normal reaction, long time squatting will appear back pain, in addition there may be other reasons, it is recommended that patients go to the hospital, a clear diagnosis, treatment for the cause.