Children’s fever may be caused by infection, and may also be caused by Burkitt’s lymphoma and other physiological factors such as summer fever. 1. Infection: all kinds of infections, such as upper or lower respiratory tract infection, digestive system infection, urinary system infection, etc., can lead to children with elevated body temperature, and after symptomatic treatment such as anti-infection, the body temperature can return to normal. 2. Burkitt’s lymphoma: Burkitt’s lymphoma is a kind of malignant tumor with high aggressiveness originated from mature B cells in follicular growth centers, which can also lead to the symptoms of fever in children. 3. Physiological factors: for example, in summer heat, there is often persistent low-grade fever, with no abnormality on examination, and the body temperature drops in the air-conditioned room. Often occurs in small infants. Children may also have other causes of fever, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.