The reason for the cold waist is mainly the following three aspects: the first is due to the sweating of the waist skin after strenuous exercise, due to more sweat, sweat accumulation, with the evaporation of sweat will lead to a drop in local temperature, when touching with the hands will feel the cold waist situation. The second situation is the lack of clothing coverage, especially in the usual blowing air conditioning, blowing fans and doors and windows convection, will produce local skin stimulation, so it is easy to cause the waist cold situation. Especially when there is sweat evaporation, it will lead to a more pronounced cold feeling. The third condition is due to localized sterile inflammatory lesions, and these inflammations can produce stimulation of the peripheral circulation, leading to constriction of small blood vessels. When the arterial blood supply decreases, the lumbar location does not receive enough energy and heat support, which can lead to coldness in the lumbar region. And as venous return decreases, it leads to more and more inflammatory buildup, and the vicious cycle leads to more pronounced coldness in the lower back.