The types of fever can be divided into the following types of fever: audible fever, flaccid fever, intermittent fever, regressive fever, undulating fever and irregular fever: First, audible fever. It refers to a body temperature significantly higher than 39-40℃, and the temperature fluctuation within 24 hours does not exceed 1℃, and is commonly seen in typhoid fever, lobar pneumonia, epidemic encephalomyelitis, and tsutsugamushi disease. Second, flaccid fever. It is the type of temperature curve in which the body temperature fluctuates more than 2℃ within 24 hours, when the lowest point does not reach the normal level, commonly found in the remission period of typhoid fever, septicemia, rheumatic fever, bacterial liver abscess, etc. Third, intermittent fever. The body temperature suddenly rises to a peak lasting several hours, and then quickly drops to normal levels, and the fever-free period can last from one day to several days, so that the high fever period and the fever-free period repeatedly alternate, commonly in malaria, acute pyelonephritis, etc. Fourth, regression fever. It refers to the type of high fever that lasts for a few days and then subsides on its own, but then reappears after a few days with the same temperature curve, and is seen in regressive fever, Hocking, Hodgkin’s disease, etc. Fifth, wavy fever. The body temperature gradually rises to 40 ℃ or more, 15 days later gradually decreases to normal level, lasts for several days and then gradually rises again, so repeatedly many times, commonly in brucellosis. Sixth. Irregular fever, the temperature curve of fever is irregular.