There may be several reasons for the pain when sitting: first, lumbar muscle strain, lumbar muscle strain patients can have symptoms of lumbar pain when sitting, this is due to chronic muscle damage caused by long-term strain or cold in the lumbar muscles, there can be symptoms of pain when sitting on the waist, it is necessary to conduct relevant physical examination and examination to exclude other diseases for diagnosis; second, lumbar dorsal myofasciitis, lumbar dorsal myofasciitis is caused by chronic aseptic inflammation of the lumbar dorsal fascia, there can be symptoms of pain when sitting on the waist. The second, lumbar dorsal myofasciitis, lumbar dorsal myofasciitis is caused by chronic aseptic inflammation of the lumbar dorsal fascia, which can lead to symptoms of pain when sitting on the waist, then we should carry out relevant physical examination, early diagnosis and treatment; third, lumbar spine instability, lumbar spine instability can appear when sitting on the waist symptoms of pain, often pain in the middle of the lumbar spine, then we should carry out early X-ray, CT, nuclear magnetic examination of the lumbar spine for diagnosis.