Back sitting pain lying without pain is considered to be improper sitting posture, lumbar back musculoskeletal inflammation, cervical spondylosis and other causes. 1. Improper sitting posture: excessive bending when sitting and standing, long time sitting and standing, etc. can cause some people to have back pain when sitting and lying down phenomenon. 2. Lumbar back myofasciitis: the cause is not clear, may be related to muscle strain, sitting and standing for a long time and other factors. Patients mainly manifested as low back pain, pressure pain, stiffness, etc., some patients may manifest as back pain when sitting and lying down. 3. Cervical spondylosis: cervical spondylosis is related to cervical degeneration and chronic strain. Patients are often accompanied by neck and back pain, stiffness, numbness and weakness of the limbs, nausea and vomiting, dizziness and other symptoms, and some patients can be manifested as back pain lying down. It is recommended that those who have back pain when sitting or lying down should consult a doctor for examination, so that the disease can be clarified and treated according to the doctor’s instructions.