Children with normal morning and afternoon fever may be caused by bacterial viral infections and chronic blood diseases. 1. Viral bacterial infections: for example, bacterial viruses cause respiratory infections, gastrointestinal infections, urinary tract infections and so on. Before the disease is cured, there is inflammation in the body, which may lead to an increase in body temperature. 2. Blood system diseases: for example, red blood cell disease, white blood cell disease, hemorrhagic disease, thrombotic disease, leading to a decline in the body’s immunity to pathogens, which can easily cause fever. Most children have fever, which tends to occur in the afternoon and evening. It may be that in the morning and midday the mental state is better and less susceptible to the harmful effects of pathogens. After a day’s activities, in the afternoon and evening, the body is weak and prone to cause fever. It is recommended to pay attention to the change of axillary temperature, the body temperature does not exceed 38.5 ℃, can be physical antipyretic. If the temperature exceeds 38.5℃, physical antipyretic should be accompanied by relevant medication for the cause of the illness, and if necessary, consult the pediatrician of the hospital to avoid delaying the condition.