Cold feet in summer may be caused by physiological factors, such as staying in an air-conditioned room for a long time, or it may also be caused by kidney yang deficiency and external wind, cold and dampness. For example, if the wind, cold and dampness are felt for a long time, or if the yin and dampness in the body are prevalent, the cold is the main cause of stagnation and blockage of qi, resulting in yang qi can not reach the end of the limbs, then it may lead to the phenomenon of cold feet in the summer. 1. Physiological factors: prolonged exposure to low temperatures, such as staying in an air-conditioned room, may lead to the phenomenon of cold feet in the summer. 2. Kidney yang deficiency: factors body yang deficiency or prolonged illness, loss of excessive, old age due to the weakness of yang deficiency in the kidney, may appear in the summer the symptoms of cold feet, accompanied by mental instability, shortness of breath and wheezing, lumbar and knee pain, impotence, tongue pale fat, moss white thick, pulse sinking, and other symptoms. Excluding physiological factors, summer cold feet may have other causes, it is recommended to timely medical diagnosis and treatment, so as not to delay the condition.