Chills all over the body from a cold are a normal reaction to the initial stage of external wind and cold, and are caused by external evil attacking and damaging the body’s Yang energy. This may also occur if the patient has a deficient body. When the body is attacked by wind, cold, damp and other external evil, the external evil will enter the body through the skin couples and hair orifices, which will deplete the body’s yang energy and cause the body to feel cold all over, which is a normal phenomenon of disease development. When the body mobilizes its own positive energy to fight against evil, the body will become hot and accompanied by the symptom of sweating, and then it will not feel cold. Also, when the sweat is out, the disease will be resolved with the sweat. If this cold persists for a long time, it also indirectly indicates the patient’s own state of insufficient righteousness and weakness of yang energy. If the patient’s own strength to resist evil is insufficient, he or she will be unable to mobilize the righteous qi to resist the evil going out, which will cause the patient to feel cold for a long time. This cause of generalized coldness is also accompanied by symptoms such as tiredness, laziness, lazy speech, whispering and drowsiness. The coldness is mainly caused by the cold evil visiting the skin and meridian tissues of the body and depleting the body’s Yang energy. If the condition does not recover even after a long period of time, the patient should also consider the state of Yang Qi deficiency.