The swollen abdominal lymph nodes in children are often associated with acute diarrhea and upper respiratory tract infections, which in layman’s terms means diarrhea, and colds and fevers, because diarrhea and colds and fevers are often viral infections, and viral infections can invade the circulatory system of the whole body and can run down the bloodstream and all over the body. The most common areas of enlargement are the abdomen, the neck, and these lymph node groups under the jaw and behind the ears, while the lymph nodes in the abdomen are swollen. Some children will have irregular stomach pain, the site of the pain is not very clear, often wandering, the stomach is not swollen, and when the doctor examines it, there is no fixed pressure point when the stomach is felt. In this case, the lymph node inflammation should be detected by ultrasound and treated symptomatically with cephalosporin anti-inflammatory drugs.