Lumbar daytime pain at night sleep pain may be caused by the lumbar cold, may also be lumbar muscle strain, ankylosing spondylitis and other causes. 1. Lumbar muscle strain: it is a kind of aseptic inflammation, which can be caused by acute lumbar sprain, overstrain and other factors. The main symptoms can be seen as severe pain when standing upright, and pain relief after changing position. 2. Ankylosing spondylitis: it is a chronic inflammatory disease, which can be caused by heredity, infection and other factors. The main symptoms can be seen in the lumbosacral region, dull pain, night and morning pain is obvious. 3. Cold lumbar: cold lumbar at night when sleeping, will cause lumbar pain, and daytime activities, lumbar muscle blood circulation accelerated, pain symptoms will be significantly relieved, or even disappear, the patient will not feel significant local pain symptoms. If the waist does not hurt during the day and sleep pain at night, after excluding physiological reasons, the patient should go to the hospital in time for hospital-related examinations, in order to clarify the cause of the disease, and actively cooperate with the doctor’s treatment.