Children’s recurrent high fever may be caused by infectious factors, such as viruses, bacteria, mycoplasma, etc., but also may be related to non-infectious factors, such as leukemia and other malignant tumors, etc., the specific analysis is as follows: 1. Infectious factors: the child’s repeated fever may be bacteria, viruses or mycoplasma infection symptoms, such as respiratory infections, but also accompanied by a runny nose, cough, sore throat and other adverse reactions. 2. Non-infectious factors: the above situation in children may also be related to non-infectious factors, such as leukemia, connective tissue disease, other malignant tumors. Therefore, parents need to go to the hospital in time to conduct relevant examinations when they find that their children have the above conditions, and actively treat the symptoms after clarifying the cause of the disease.