Sleeping in a hard bed lumbar pain may be related to physiological factors such as the hardness of the bed itself, may also be related to pathological factors such as lumbar disc herniation, lumbar dorsal musculoskeletal fasciitis, lumbar muscle strain and so on. 1. Physiological factors: the physiological curvature of the human lumbar spine is convex to the front, after sleeping in a hard bed, the back of the waist and the bed board has no contact, can not meet the requirements of the human lumbar spine physiological curvature, so that the lumbar muscles are suspended, the lumbar muscles have been in a state of tension, will damage the lumbar muscle, lumbar pain occurs. 2. Pathological factors (1) Lumbar disc herniation: if the patient himself has lumbar disc herniation symptoms, sleep too hard bed, lumbar vertebrae parts have no support, long-term, will aggravate the lumbar disc herniation symptoms, occurring hard bed back pain. (2) Lumbar dorsal myofasciitis: mainly caused by long-term muscle strain, such as sedentary standing, trauma, etc., often manifested in the lumbar back pain, muscle spasms, etc., which may lead to the emergence of back pain in a hard bed. (3) lumbar muscle strain: mainly due to the lumbar muscles, fascia, ligaments and other soft tissues of the cumulative, chronic injury caused by, often showing lumbar pain, activity limitation, etc., which may lead to the emergence of back pain sleeping in a hard bed. Sleeping in a hard bed lumbar pain causes more, if the pain persists without relief or gradually aggravated, patients should consult a doctor in a timely manner, under the guidance of the doctor for standardized treatment.