Many diseases can cause fever, and the characteristics of fever caused by different diseases can vary. The common fever referred to here may be caused by acute upper respiratory tract infection, and the temperature of common fever is mainly low and moderate fever, and high fever state is rarely seen, while most of the fever caused by viral infection is mainly moderate fever and high fever, and it persists. Ordinary fever recedes after the inflammation is controlled, does not recur, and has little fluctuation throughout the day. The fever caused by viral infection, like this new coronavirus infection, is mainly low to moderate fever in patients with mild symptoms in the early stage.