Lumbar sitting pain standing pain may be lumbar muscle strain, lumbar disc herniation, ankylosing spondylitis and other diseases. 1. Lumbar muscle strain: the occurrence of this disease is related to acute injury without healing, chronic inflammatory response, lumbar spine congenital deformity, etc., can be induced by sedentary, obesity and so on, so the patient will appear lumbar sitting pain standing without pain. 2. Lumbar intervertebral disc herniation: the basic cause of this disease is intervertebral disc degeneration. Secondly, it also includes intervertebral disc injury, heredity, abnormal development of lumbar vertebrae, etc. It is often triggered by factors such as prolonged work at desk, exertion, heavy physical activities, etc., which leads to lumbar pain, sciatica and other symptoms, and partly manifested in the form of lumbar pain when sitting and standing. 3. Ankylosing spondylitis: the cause of the disease is not clear, but research has shown that it may be related to genetics, pathogenic microbial infection, immunity and environmental factors. Patients will have inflammatory low back pain, often in the morning or sedentary significantly aggravated, often manifested as lumbar sitting pain standing pain. It is recommended that patients with lumbar sitting pain but no standing pain should go to the hospital to complete the relevant examinations to clarify the specific causes.