Visibility of mesenteric lymph nodes indicates the presence of enlarged mesenteric lymph nodes detected by ultrasound. Under normal circumstances, mesenteric lymph nodes cannot be seen. If an ultrasound examination reveals enlarged mesenteric lymph nodes, it indicates that there is inflammation or other lesions in the mesenteric lymph nodes. The main causes of mesenteric lymph node inflammation include the following: 1. Consider that the child is born with imperfect development of the greater omentum, resulting in inflammatory stimulation in the abdominal cavity of the body, causing the mesenteric lymph nodes to swell; 2. Consider that the mesenteric lymph nodes are reactive hyperplasia and swelling due to upper respiratory tract infection, etc. The main treatment for enlarged mesenteric lymph nodes is symptomatic anti-inflammatory treatment, which can be combined with oral antibacterial drugs, including cephalosporins and other drugs. At the same time, hot compresses such as warm water bags can be applied locally to promote the reduction of inflammation and the disappearance of swollen lymph nodes. The most important point is to pay attention to a light diet, eat less spicy, stimulating and cold food, and eat more fresh vegetables and fruits, etc. Other causes of swollen mesenteric lymph nodes need to be actively identified and then treated accordingly.