Chills are a kind of muscle contraction, accompanied by muscle spasm nature of shivering, chills common causes are as follows: 1, sudden chills, the most common reason is the body infection, when the body infection body temperature will suddenly increase, such as patients appear acute peritonitis, or acute septic shock, at this time there will be a sudden increase in body temperature and lead to chills. 2, patients in the infusion of fluids or blood transfusion, because the infusion will appear pyrogenic reaction, then the body will also appear chills. 3. When the temperature of the external environment is too low, such as when the patient is drowning in fresh water or seawater, the clinical symptoms and manifestations of chills may occur. 4. When the patient is undergoing surgical anesthesia, because of the epidural anesthesia or even general anesthesia block, the temperature of the area of skin anesthesia increases, while the temperature of the non- The temperature of the area of the tissue decreases, and there will be a dysregulation and change in the point of temperature regulation after anesthesia, so chills will also appear after anesthesia.