Back pain but not after lying down may have the following reasons: First, lumbar muscle strain, lumbar muscle strain is often due to cold or sedentary, long-term bending work, which can appear when lying down does not hurt, but in the morning when the pain may be more serious, in the activity of a while after the pain will be reduced, but after a day of exertion pain will be aggravated, then to carry out relevant checks to exclude other diseases The diagnosis should be made. Secondly, lumbar dorsal fasciitis, the cause of lumbar dorsal fasciitis is similar to that of lumbar strain, which can also appear as no pain after lying down, but pain can appear after exertion. Third, lumbar instability or lumbar spine slippage, lumbar instability and lumbar spine slippage are common in the elderly lumbar spine degeneration, or congenital lumbar spine developmental abnormalities, then the lumbar spine X-ray and CT examination should be carried out for diagnosis and treatment.