Sleeping soft bed back pain may be lumbar muscle strain, osteophytes, lumbar disc herniation and other diseases. 1. lumbar muscle strain: actually for the lumbar muscles and their attachment points fascia or periosteum of chronic injury inflammation, is one of the common causes of lumbago, will lead to sleep soft bed back pain. 2. Osteomalacia: it is a bony growth formed on the edge of the normal bone, often with localized lumps, pain, activity limitation and other clinical symptoms, which will lead to sleep soft bed back pain. 3. Lumbar disc herniation: the nucleus pulposus tissue protrudes from the rupture place, causing the adjacent spinal nerve root to suffer from irritation or compression, thus producing lumbar pain, which will lead to soft bed back pain. There may be other causes of soft bed back pain, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, to give targeted treatment or treatment.