Sleeping on a cooler may be due to its own environmental stimuli, lumbar myofascial spasm and other physiological reasons, may also be due to lumbar disc herniation, spinal stenosis and other pathological factors. 1. Physiological reasons: In summer, due to the high temperature, many people like to sleep in a cooler, sleeping in a cooler for a long time will lead to long-term cold stimulation of the soft tissues of the waist, resulting in a slowdown in local blood circulation, the accumulation of metabolic products, and stimulation of the nerve root to appear pain. In addition, some mats may be hard, long time sleeping mats, may cause lumbar myofascial tension, spasm, may also appear the above symptoms. 2. Pathological factors: when the lumbar region itself is combined with the underlying diseases, the acute attack of the underlying diseases may also be induced by sleeping on a cooler for a long time, leading to the symptoms of lumbar pain, such as lumbar intervertebral disc herniation caused by local myofascial compensations or compression of the spinal nerve root leading to lumbar pain or spinal stenosis caused by the pain caused by the nerve compression. Sleeping on the cooler sleep back pain may also have other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.