A child with recurrent fever for ten days may be caused by severe pneumonia, sepsis, Kawasaki disease and other diseases. 1. Severe pneumonia: Pneumonia refers to the inflammation of the terminal airways, alveoli and interstitium of the lungs, and when the patient’s condition is more serious, it may cause recurrent fever. 2. sepsis: sepsis refers to the manifestation of infection combined with systemic inflammatory response, the main symptoms of chills, high fever, accompanied by skin rashes, hepatosplenomegaly, etc. Children with recurrent fever for ten days may be caused by sepsis. 3. Kawasaki disease: Kawasaki disease is a connective tissue disease that is prevalent in children under 5 years of age and infants and young children, with clinical manifestations such as persistent fever, conjunctival congestion, varying degrees of oral mucositis, polymorphic rash, etc., so the child’s recurrent fever for ten days may be caused by Kawasaki disease. In addition, sepsis, infectious mononucleosis, tuberculosis and other diseases may also cause recurrent fever, it is recommended that patients seek medical examination in a timely manner to clarify the cause of the disease and then targeted treatment.