I often see children who come to the clinic with colds and abdominal pain, and when I see such children, I often ask the parents to get an ultrasound to confirm whether it is mesenteric lymphadenitis. Mesenteric lymphadenitis is one of the common causes of abdominal pain in pediatric patients and is clinically confused with acute appendicitis, mostly in children under 7 years of age. Typical symptoms are fever, abdominal pain and vomiting, sometimes accompanied by diarrhea or constipation. It is more common in boys than in girls and is often complicated by upper respiratory tract infections or intestinal infections in winter and spring, with a tendency to increase gradually. The typical manifestations are sore throat, tiredness and discomfort followed by fever, abdominal pain, vomiting, sometimes accompanied by diarrhea or constipation after upper respiratory tract infection, about 20% of children have enlarged lymph nodes in the neck, abdominal pain is the earliest symptom of the disease, which can be in any part, but because the lesion mainly invades a group of lymph nodes in the terminal ileum, it is common in the right lower abdomen. The most sensitive site of tenderness may be different on each physical examination, and the site of pressure pain is near the midline or high, unlike acute appendicitis which is fixed and less severe than acute appendicitis, with less rebound pain and abdominal muscle tension, and occasionally a small nodular mass with pressure pain can be found in the right lower abdomen, which is an enlarged mesenteric lymph node. In children with clinical symptoms similar to appendicitis, but with milder disease and without abdominal muscle tension, acute mesenteric lymphadenitis should be considered. Complications: itself often a complication of upper respiratory tract infection because the child more vomiting, eating less, so water, electrolyte disorders are common; some patients may be complicated by intussusception, complicated by intestinal obstruction, diagnosis: when the child health search in clinical fever, abdominal pain, vomiting and accompanied by upper respiratory tract infection, or occur after the intestinal inflammation, no abdominal muscle tension should be considered acute mesenteric lymphadenitis, the characteristics of the disease: 1. The disease is mostly complicated by upper respiratory tract infection or intestinal infection with clinical manifestations of fever, abdominal pain, vomiting, etc. 2, abdominal pain to the right lower abdominal pain is common paroxysmal, spasmodic pain, rebound pain and abdominal muscle tension is rare. 3, abdominal pressure pain is not fixed and can change with the change of position. 4.Ultrasound examination shows enlarged mesenteric lymph nodes. 5.Diagnosis of this disease needs to be differentiated from acute appendicitis, intestinal hyperperistalsis, intestinal ascariasis and other acute abdominal diseases. According to our experience, children with high fever and abdominal pain in upper respiratory tract infection or intestinal infection should consider the possibility of complicating acute mesenteric lymphadenitis. Differential diagnosis: The diagnosis of acute mesenteric lymphadenitis requires the exclusion of hyperactive intestinal motility, intestinal ascariasis and other causes of abdominal pain. 1. Acute appendicitis The symptoms are similar, but acute mesenteric lymphadenitis is milder, with a slower onset, and typical children with appendicitis have metastatic right lower abdominal pain, fixed pressure and rebound pain in the right lower abdomen, and increased total leukocyte count and neutrophils in abdominal muscle tension. 2, tuberculous mesenteric lymphadenitis starts slowly, in addition to abdominal pain, fever, often with night sweats, loss of appetite and other symptoms of tuberculosis poisoning, and accompanied by other parts of the tuberculosis infection, tuberculin test or tuberculosis antibody can help to identify. Infectious mononucleosis may also present with enlarged mesenteric lymph nodes but is often accompanied by enlarged cervical lymph nodes and splenomegaly, and examination of anomalous lymphocytes and EBV potency is helpful for diagnosis. After a long period of clinical treatment and observation, I found that mesenteric lymph nodes in children are caused by abnormal gastrointestinal function. For example, uneven hot and cold diet; eating milk, seafood, spicy, beef and mutton and other high-calorie, indigestible food; watching TV and eating, doing strenuous activities before and after meals, eating before bedtime, all these factors will stimulate the intestines and stomach, causing abnormal gastrointestinal function. Only when the gastrointestinal function is well regulated will mesenteric lymphadenitis be cured. The clinical evidence is often based on qi stagnation and blood stasis, and food stagnation, often with good results.