Children’s fever recedes and recurrent fever, usually associated with acute upper respiratory tract infection, pneumonia, bronchitis and other diseases, may also be related to blood system diseases, specific analysis is as follows:. 1. Acute upper respiratory tract infection: if children catch a cold when infected with bacteria or viruses, resulting in bacterial or viral colds, symptoms of upper respiratory tract infection, in the early stages of fever, if only the application of antipyretic drugs to temporarily reduce fever, the body of bacteria and viruses are not effectively treated, will cause children to recurring fever. 2. Pneumonia: If children do not have proper treatment after catching a cold, it leads to inflammation into the lungs, causing pneumonia, and the patient will also have recurrent fever symptoms. 3. Bronchitis: if children suffer from bronchitis, in the process of medication, not timely control of inflammation, pathogens have not been completely removed, can also cause recurrent fever. At the same time, some children have poor physical condition, low resistance, in the case of pneumonia or bronchial inflammation is controlled, but not completely cured, also prone to recurrent fever. 4. Blood system diseases: If children suffer from acute leukemia, chronic leukemia and other blood system diseases, it will also cause abnormal blood production function and recurrent fever. If a child’s fever recurs after the fever has subsided, there may be other reasons, so parents are advised to take the child to the hospital for a relevant examination to find out the cause of the fever and treat the symptoms.