The causes of recurrent fever in children may be viral infections, bacterial infections and non-infectious factors. 1. Viral infections: Viral infections are generally self-limiting diseases, and in the process of healing, recurrent fever may occur, usually lasting for about a week. 2. Bacterial infections: If the antibiotics used in the treatment of bacterial infections are not sensitive antibiotics or the duration of treatment is insufficient, which leads to recurrence of the disease, then it may lead to recurrent fever in children. 3. Non-infectious factors: mainly immune diseases or tumor diseases such as Kawasaki disease, lupus erythematosus, leukemia and so on. Children with recurring fever may also have other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.