The back of the neck appears cool, mainly because of two reasons: first, because usually wear collar lower, and the surrounding environment temperature is relatively low, which leads to the cervical spine parts of the skin and subcutaneous tissue is easy to appear cold, so will feel the cervical spine parts of the cold. Second, due to the cervical spine part itself has inflammatory lesions, such as cervical spine often head down, or sleep pillow is not suitable to lead to physiological curvature straightening, easy to form in the cervical spine part of the degeneration, osteophytes or calcification of the situation, but also may appear muscle and ligament and other soft tissues of the degeneration of the formation of inflammatory lesions. These inflammatory foci will stimulate the peripheral circulation, which will lead to a decrease in the blood supply of small arteries, and the cervical spine will be cold when it is not supplied with sufficient energy and electrolytes. In addition, because of the decline in venous return, the metabolites produced will further increase the accumulation, resulting in more obvious vasoconstriction, thus aggravating the cervical spine coldness.