Fever belly button pain may be caused by acute gastroenteritis, appendicitis, mesenteric lymphadenitis and other causes, the specific causes need to go to the hospital to determine the examination. 1. Acute gastroenteritis: acute gastroenteritis is generally caused by pathogenic microbial infections, eating a lot of cold food, low immunity, etc., the patient’s main symptoms are vomiting, diarrhea, abdominal pain, headache, etc., and some patients will be accompanied by fever, malaise, myalgia and other symptoms. 2. Appendicitis: appendicitis is usually caused by infection, improper diet, cold and other reasons, when acute appendicitis attack, the patient’s abdomen will appear persistent pain, in the right lower abdomen before the transfer of the umbilical cord area pain, the patient will also appear high fever, fatigue, heart rate, chills and other systemic symptoms. 3. Mesenteric lymphadenitis: mesenteric lymphadenitis is generally caused by infection with Coxsackie B virus, some patients may also be infected with parasites, bacteria, mycoplasma and other causes, the patient will appear in the early stage of the disease fever, umbilical cord or abdominal pain, with the development of the disease, the patient will appear severe pain, some patients will also appear diarrhea, vomiting symptoms. If there are symptoms of fever and navel pain, you should go to the hospital in time for medical treatment and follow the doctor’s instructions after diagnosis.