The causes of high fever in children can be caused by infectious factors such as respiratory infections, digestive infections, neurological infections, or due to non-infectious factors. 1. Respiratory infections: influenza, pneumonia, acute bronchitis, etc. can be manifested as high fever, and often accompanied by coughing, coughing up sputum, dyspnea and other symptoms. 2. Digestive system infections: dysentery, autumn diarrhea, etc. can appear as high fever, often accompanied by diarrhea, abdominal pain, vomiting and other symptoms. 3. Neurological infections: high fever is a typical manifestation of neurological infections, accompanied by convulsions, projectile vomiting, headache, drowsiness and other symptoms. 4. Non-infectious fever: Kawasaki disease, systemic lupus erythematosus, etc. can cause high fever with typical skin and mucous membrane manifestations. Children may also have other causes of high fever, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.