Sudden cold and shivering may be a sudden cooling of the environment; it may also be the early stage of infectious diseases; it may also be hypoglycemia, which needs to be analyzed on a case-by-case basis. The body suddenly cold shivering, may be located in the environment temperature suddenly drop, the human body temperature also dropped, at this time the human body temperature regulation center will feel the cold, stimulate the shivering response, through the muscle contraction and shivering, increase the phenomenon of body heat production. Sudden cold shivering of the body may be the early stage of infectious diseases, which can lead to muscle chills, no sweat, body chills and other phenomena. Sudden cold shivering may be due to hypoglycemia. Hypoglycemia may cause glucose deficiency in the body due to overconsumption, resulting in sudden shivering, palpitations, chills, hunger, and accelerated heart rate. If it is due to environmental factors, you can drink some hot water or raise the room temperature, etc., and pay attention to increase the warmth of clothing to improve the situation. If the patient continues to experience chills and shivering, he/she should consult a doctor immediately for a clear diagnosis to avoid delaying his/her condition.