How many days it takes to get well from mesenteric lymphadenitis is related to the patient’s condition, physical fitness, etc. and cannot be generalized. In general, if the patient is actively treated, mild cases can be relieved in a week, and more serious cases can be relieved in about a month. Mesenteric lymphadenitis is a common disease in pediatrics, mostly caused by viral infections, and may present with fever, abdominal pain, vomiting and other symptoms. The duration of treatment for the disease is related to the condition and needs to be analyzed on a case-by-case basis. If the patient’s symptoms are mild, they will get better within a week; if the symptoms are severe, they will usually decrease or disappear in about a month with proper medication or intravenous fluid replacement. Parents who find their children with fever, abdominal pain and other symptoms should seek medical treatment in time to avoid delaying the condition. At the same time, they should help their children to develop good living habits, pay attention to rest and keep warm, and eat less spicy and stimulating food.