There is no scientific evidence to support the claim that fever is easy to develop at night, and some diseases may appear to have no fever during the day and fever at night, which may be related to a variety of factors, such as the role of the central body temperature regulation, and lower temperatures at night. Fever, or fever, is a symptom of pathologic elevation of body temperature, a common clinical symptom that can be seen in a variety of infectious and non-infectious diseases. Some diseases may not occur during the day and night fever, such as tuberculosis, but this does not mean that the night is prone to fever, its occurrence may be related to the role of the body temperature center regulation, the night temperature is lower, and other factors. If night fever occurs frequently, it is recommended to go to the hospital for further investigation.