The most common cause of acute fever in children is infection, including bacteria, virus, mycoplasma, etc. In addition to fever, children with different parts of the infection may have different manifestations, such as respiratory tract infections, may appear nasal congestion, runny nose, sore throat, sore throat, earache, cough, wheezing, etc.; if it is a gastrointestinal tract infection, may appear abdominal pain, nausea, vomiting, etc.; if it is a urinary tract infection, mainly manifests In case of urinary tract infection, the main manifestations are abnormal urination, such as frequent urination, urgent urination, and painful urination; in case of neurological infection, abnormalities of the mind may occur, and the usual ones may include irritability, depression, drowsiness, convulsions, and convulsions. In addition, there are some acute infectious diseases with fever, where an idiosyncratic rash and corresponding clinical manifestations may be seen. Another common cause of fever in babies is non-infectious factors, such as allergies, heat stroke, and acute traumatic rheumatic diseases, which are some of the common causes of acute fever in children.