The symptom of chills is a conscious fear of cold. “Cold” refers to the patient’s conscious fear of cold. The patient’s conscious fear of cold, which can be relieved by adding more clothing or warming up near a fire, is called fear of cold. Fear of cold may be caused by wind and cold evil qi invading the surface of the muscle, blocking the Wei Yang (yang qi on the surface of the muscle), which is the main symptom of the externally sensed surface evidence (mainly manifested as respiratory symptoms after feeling the external evil qi), also known as the “evil cold (fear of cold)”, accompanied by body aches and pains, nasal congestion, coughing, and other clinical symptoms. Fear of cold may also be caused by the weakness of yang qi, weak and sparse weiyang, which cannot warm the surface of the muscles. At the same time, it may be accompanied by pale or gray-black color, low temperature of hands and feet, mental fatigue, swelling and other symptoms. If you have symptoms of cold, it is recommended to seek medical treatment promptly.