Mesenteric lymphadenitis in adults includes symptoms such as cough, sore throat, fever, abdominal pain, nausea, etc. Mesenteric lymphadenitis is very common and is often secondary to upper respiratory tract infections, which can lead to fever, sore throat, and cough. After the occurrence of mesenteric lymphadenitis, the patient will experience abdominal pain, usually in the right lower abdomen and around the umbilicus, often accompanied by nausea, pressure pain in the right lower abdomen during physical examination, and even rebound pain and muscle tension. Patients are advised to go to the hospital in time and need to improve relevant examinations, such as routine blood, ultrasound, CT, etc., to be able to make a clear diagnosis. After diagnosis, anti-infection treatment is needed, intravenous antibiotics with broad-spectrum antibacterial effect are recommended, symptomatic treatment is also needed, if fever occurs, cooling treatment is needed, and the patient needs intravenous rehydration if the diet is poor.