Whether it is a fever in adults or children, the corresponding body temperature will have a certain change, and it is rare that a body temperature stays at a relatively high position for a long time. For patients with fever, the clinic will generally use some drugs to carry out antipyretic treatment, after the use of such drugs, the body temperature can generally be reduced from a relatively high position to normal. However, because the corresponding condition is not controlled in time, the body temperature will rise for a period of time afterward, and there will be this phenomenon of fever for a while, and a while back to normal, and there are some patients who do not use antipyretic drugs for the body temperature to fall on its own, and then rise again, purely through this change, and not be able to point to which kind of disease, if this performance occurs in the absence of the application of antipyretic drugs, it can be determined by the specific temperature change. If such a manifestation occurs without the application of antipyretic drugs, it can be determined by the specific temperature changes to determine which type of fever, such as regression fever, undulant fever, flaccid fever, intermittent fever and so on, and through these types of fever, it is helpful in determining the disease.