The possible reasons for a child’s recurring fever include poor thermoregulation, inflammation in the body that has not subsided, and the re-invasion of pathogens. 1. Poor thermoregulation: Because the nerve center that regulates the body temperature is not fully developed, the ability to regulate the body temperature is poor, and it is easier for the child to experience the symptoms of a cold and fever. 2. Inflammation in the body has not subsided: pathogens such as upper respiratory tract infections still exist in the body and are not controlled, leading to a strong immune response in the body, which can lead to recurrent fever in children with colds. This situation is common in influenza or severe colds. 3. Pathogen re-invasion: Most of the bacteria or viruses re-invade, causing symptoms of upper respiratory tract infections, if the child’s physical quality is poor, the body’s immunity is low, there will be the symptoms of the child’s cold and recurring fever. If a child has a recurring cold and fever, there may be other conditions, you can go to the hospital to improve the relevant examination, in order to clarify the situation and take appropriate measures.