The causes of lumbar back pain from sleeping on a hard bed are as follows: 1. Acidic metabolites: sleeping on a hard bed does not produce clinical symptoms of lumbar back pain in the short term, but if you sleep on a hard bed for a long time, it will cause soreness in the lumbar muscles. Mainly because the muscles of the lumbar back are under continuous compression, the blood vessels within the muscles cannot ensure sufficient blood supply, so a large amount of acidic metabolites will be produced in the muscles, thus inducing clinical symptoms of lumbago. 2. Increased pressure on the lumbar spine: sleeping on a hard bed does not conform to the physiological curvature of the lumbar spine, which will increase the pressure on the lumbar spine, thus causing lumbar degeneration, which will reflexively cause spasms and tension in the lumbar muscles, thus causing The clinical symptoms of lumbar pain. Therefore, it is best for patients not to sleep on a hard bed for a long time, and it is best to lay a soft mattress on the bed when sleeping on a hard bed.