The old man is afraid of cold, drink hot water on the sweat mainly and Yang Qi deficiency, Wei table is not fixed close relationship. After old age, the metabolic function decline, organs, qi and blood of the balance of yin and yang imbalance, in the physiology of a variety of signs of aging. Sun Si invited “old age big example” contained: “more than fifty years old, yang qi day decline, loss and day to day.” The main symptom of insufficient yang qi in the elderly is afraid of cold. The elderly viscera thin and brittle, lack of essence, yin can not camp guard within, yang can not guard outside, the ability to adapt and defense are relatively low, that is, the so-called “coupling (pores) is not dense, the guard outside is not solid”, the state of the guard is not solid will lead to the old man drink some hot water on the sweating. If the elderly body abnormal sweating, should be timely to the hospital, a clear diagnosis by the doctor to arrange the treatment program, not blindly deal with, so as not to delay the condition.