There are many causes of recurrent fever in six-year-olds, most of which are infectious factors, such as respiratory tract infections; in addition, non-infectious factors, such as blood disorders, can also cause this symptom. 1. Infectious diseases: the most common is respiratory tract infection. If the child’s physical quality is poor and immunity is low, recurrent infections of the respiratory tract, especially the upper respiratory tract, manifested by coughing, runny nose, fever and other manifestations, and other systemic infections, such as pyelonephritis, gastroenteritis and other infections that are not effectively cured, leading to recurrent episodes. 2 non-infectious factors: can be seen in the blood system diseases, such as leukemia, lymphoma; immune diseases, such as Kawasaki disease, children’s rheumatoid, etc., can cause recurrent occurrences, but generally more rare. Six-year-old children with recurrent 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.