There are two main reasons for feeling low back pain after getting up in the morning after sleeping at night: in the first case, the muscles of the waist and the surrounding soft tissues do not have sufficient relaxation and rest when sleeping, for example, if the bed board is uneven or if the hips and knees are not flexed when lying down, it will lead to suspension of the waist, which will lead to fatigue of the muscles and the surrounding soft tissues for a long time and form strain, gradually leading to the appearance of inflammatory lesions, and inflammation will have an effect on The inflammation will stimulate the peripheral nerves, and the symptoms of lumbar pain will easily appear. However, after getting out of bed and moving around for a while, the muscle tissue becomes more relaxed and blood circulation can be effectively accelerated, so the pain symptoms can be significantly reduced. In the second case, if the lumbar region is cooled during sleep at night, such as blowing air conditioner, convection between doors and windows, or less covered by clothes, it will cause the lumbar region to be cooled, and once it is cooled, the muscle tissues will become more tense, blood circulation will slow down further, and venous return will decrease, resulting in inflammation and metabolic products gradually accumulating, and after the stimulation of peripheral nerves increases, the symptoms of lumbar pain will be significantly aggravated. The symptoms will be significantly aggravated. Usually, after waking up, the symptoms can be effectively relieved by applying warm water bags and keeping warm.