Pediatric abdominal mesenteric lymph node enlargement is one of the common pediatric surgical conditions with a relatively high incidence. The presence of abdominal lymph nodes is usually less serious and is mostly due to dietary problems in pediatric patients. Pediatric intra-abdominal lymph nodes are susceptible to enlargement due to a variety of pathological factors, the severity of which is determined by the specific location of the enlargement, the nature of the disease, and the predisposing factors. Usually the lymph nodes are small, smooth and soft in size, without adhesions to the surrounding tissues and without painful pressure when no lesions occur. In case of bacterial invasion, a proliferative reaction of the lymph nodes occurs, leading to enlargement. 1. Causes of pediatric abdominal lymph nodes: (1) Most of them are directly related to poor diet, upper respiratory tract infection, gastroenteritis, etc. (2) Due to the accumulation of food in the intestinal tract for a long time to produce toxins or bacteria absorbed by the lymph nodes. 2, treatment of pediatric abdominal lymph nodes: general abdominal or mesenteric lymph nodes swelling, if accompanied by abdominal pain symptoms, you need to take oral anti-inflammatory drugs for treatment, if the swelling is not strong and no abdominal pain symptoms, do not need treatment, but to prevent colds, pay attention to a reasonable diet. After a period of time, it will naturally get better or take anti-inflammatory drugs, it will also get better faster. Parents should also let their children pay more attention to rest, keep warm, avoid getting cold, eat a light diet, avoid spicy and stimulating food, avoid overeating, and go to the hospital for timely medical examination if necessary.