Mesenteric lymphadenitis is divided into tuberculous and non-specific, tuberculous can be primary or secondary, and non-specific is mainly due to streptococcal bloodstream infection, as follows: 1. Tuberculous: Tuberculous inflammation of mesenteric lymph nodes is most common in childhood, and it can be primary, or secondary to intestinal tuberculosis or pulmonary tuberculosis. In primary cases, most of the bacteria enter the lymph nodes directly through the healthy intestinal wall, or the original lesions of the intestinal wall have completely healed without leaving traces. In secondary disease, most of the lesions are evident in the lungs or intestines, and the lymph nodes are most frequently involved in the ileocecal region and in the retroperitoneal space on the medial side of the cecum and ascending colon, as well as partially in the lower portion of the mesentery of the small intestine. With the different stages of the disease, the involved lymph nodes can be acutely enlarged, with caseous changes, or forming hard nodes, calcification, etc. 2.Nonspecific: mostly occurring in children, children often feel tired and sick 1-2 days before the onset of the disease, sometimes there are sore throat, fever and other prodromal symptoms, and then there will be abdominal symptoms, mainly due to streptococcal bloodstream infection.