Sitting back pain can be caused by several reasons: first, lumbar dorsal myofasciitis, lumbar dorsal myofasciitis patients can appear sitting down back pain symptoms, then early physical examination and examination to exclude other diseases to diagnose. Secondly, lumbar muscle strain, lumbar muscle strain can also appear when sitting back pain, this time to early physical examination, early diagnosis. Third, lumbar disc herniation, lumbar disc herniation can cause lumbar disc herniation aggravated in the sitting position, compression of the nerve and cause back pain, then early CT and MRI of the lumbar spine should be taken for early diagnosis. Fourth, ankylosing spondylitis or rheumatoid spondylitis, which can also occur when sitting back pain, can have morning stiffness and sacroiliac joint pain, then early blood tests and lumbar spine X-ray and iliac joint X-ray, to early diagnosis and early treatment.