Acute mesenteric lymphadenitis is usually associated with infectious factors, and the symptoms are acute abdominal pain, fever, diarrhea, nausea and vomiting. 1. Acute abdominal pain: the typical symptom of acute mesenteric lymphadenitis is acute abdominal pain, the onset of which is more acute and the pain is more obvious, manifested as paroxysmal spasmodic pain, and the site of pain is around the navel and the right lower abdomen. 2. Fever: the patient’s body temperature will increase significantly, usually higher than 38 degrees Celsius, during the rise in body temperature, the patient will appear pale lips, shivering, fatigue, sore throat and other symptoms. 3. Diarrhea, nausea and vomiting: Acute mesenteric lymphadenitis will also cause obvious gastrointestinal discomfort, such as diarrhea, nausea and vomiting, loss of appetite, and in severe cases, it will also cause other complications, such as pneumonia, intestinal obstruction, peritonitis and so on. Therefore, when the symptoms of acute mesenteric lymphadenitis appear, it is necessary to consult a doctor in time for examination and treatment to prevent serious complications.