Sitting back pain may be lumbar muscle strain, lumbar dorsal myofasciitis, lumbar disc herniation caused by symptoms. 1. lumbar muscle strain: lumbar muscles because of long-term exertion to form chronic strain, especially the lack of exercise, long-term sedentary and standing people are prone to cause lumbar muscle strain, will produce the symptoms of sitting back pain. 2. Lumbar dorsal myofasciitis: usually caused by aseptic inflammation of the lumbar dorsal myofascia, which can lead to symptoms of back pain while sitting. 3. Lumbar disc herniation: After a lumbar disc herniation, the herniated material may press on the nerves and cause sitting back pain. Sitting back pain may also have other causes, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.