Symptoms of inflammation of mesenteric lymph nodes in young children usually include fever, abdominal pain, diarrhea or constipation, and vomiting. Pediatric mesenteric lymphadenitis is usually an acute infectious disease caused mainly by viral infections, and is often preceded by a history of acute upper respiratory tract infection. This disease can appear at the onset of fever, but the body temperature is less than 38.5 degrees Celsius; inflammation caused by abdominal pain can appear in various parts of the abdomen, commonly in the lower right abdomen abdominal pain, pain can be manifested as paroxysmal colic, cramping pain, and hidden pain, etc., usually half an hour or so, the pain can be briefly relieved; can also be accompanied by nausea and vomiting, diarrhea is common. If the child has the above symptoms, should go to the hospital as soon as possible, after a clear diagnosis of standardized treatment, so as not to cause adverse consequences.