Sitting for a long time back pain may be caused by lumbar back muscle strain, lumbar myofasciitis, lumbar intervertebral disc herniation and other reasons. 1. Lumbar back muscle strain: prolonged sitting, lumbar muscles will always be in a state of tension, lumbar muscle tension and spasm for a long time, can lead to chronic strain of the lumbar back muscle, lumbar pain symptoms. 2. Lumbar myofasciitis: chronic strain can cause lumbar myofasciitis, resulting in adhesion of the surrounding tissues, calcification, resulting in local microcirculation dysfunction, prolonged sitting will aggravate the spasm of the local muscles causing lumbar pain, accompanied by symptoms such as lumbar stiffness and activity limitation. 3. Lumbar intervertebral disc herniation: the protruding intervertebral disc can lead to nerve root compression, sitting time is too long, can exacerbate the protrusion of the intervertebral disc, aggravate the symptoms of nerve compression, the symptoms of lumbar pain aggravated. Sitting time long back pain may also be seen in the lumbar spine osteoarthritis and other diseases, if the sitting time long back pain symptoms, persistent non-relief, the patient should consult a doctor in a timely manner, a clear cause for standardized treatment.