Afternoon hypothermia with elevated body temperature, usually around 37.5°C, is mainly considered in Western medicine as a tuberculosis infection and requires a series of tests to clarify the diagnosis. From the point of view of Chinese medicine, the afternoon tidal fever, especially between 3-5 pm, the temperature is not very high, there is a term called day asr tidal fever, day asr refers to 3-5 pm, tidal fever is a regular tidal wave like the regular appearance of fever symptoms. Asr tidal fever is first described in the “Treatise on Typhoid Fever” as a result of Yang Ming heat, because 3-5 p.m. is exactly when the meridian passes through the foot Yang Ming Stomach meridian, and if there is real heat in the foot Yang Ming Stomach meridian, there will be Asr tidal fever.