General oral temperature >37.2 ℃, or rectal temperature >37.7 ℃, or axillary temperature >37 ℃ that is fever, the specific need to combine the actual situation of the individual. Normal healthy people oral temperature normal range of 36.3 ~ 37.2 ℃, an average of 37 ℃; rectal temperature normal range of 36.5 ~ 37.7 ℃, an average of 37.5 ℃; armpit temperature normal range of 36 ~ 37 ℃, an average of 36.5 ℃. 24-hour temperature fluctuations of no more than 1 ℃. In addition, the causes of fever are more common in infectious diseases such as upper respiratory tract infections, pneumonia, tuberculosis, bronchitis, sepsis, etc., but also in rheumatoid arthritis, systemic lupus erythematosus, tumor disease, etc. It is recommended that when a fever occurs, it should be paid attention to, and timely medical care to find out the cause, and cooperate with the doctor targeted treatment.