There may be several reasons for lumbar pain while sitting but not standing or lying: first, lumbar strain and lumbar dorsal fasciitis, when there is lumbar strain and lumbar dorsal fasciitis, there can be pain while sitting but not standing or lying, often due to sedentary, strain or cold, then the relevant physical examination and lumbar spine X-ray, CT, nuclear magnetic examination should be carried out for early diagnosis and treatment; second, Lumbar disc herniation, lumbar disc herniation can also appear in sitting position when the protruding disc compression nerve symptoms aggravated, but not pain when lying and standing, this time to carry out CT, nuclear magnetic examination of the lumbar spine for early diagnosis and treatment; third, lumbar instability and lumbar spine slippage, lumbar instability and lumbar spine slippage patients can also appear in sitting position when the pain aggravated, but not pain when standing and lying symptoms, this time X-rays and nuclear magnetic examinations of the lumbar spine should be performed for early diagnosis and treatment.