Children who have a stomach ache and ultrasound says lymph nodes may have mesenteric lymphadenitis, which requires the application of antibiotics, and it requires rehydration and other treatments. Children who have stomach pain and ultrasound says lymph nodes are enlarged may have mesenteric lymphadenitis, which will cause abdominal pain, usually in the right lower abdomen, when doing ultrasound, lymph nodes will be found, applying anti-inflammatory drugs, such as cephalosporin anti-inflammatory drugs, etc., which can be taken orally or by intravenous drip, and it will be decided according to the severity of the disease. If the patient’s feeding is poor, intravenous rehydration is needed, such as glucose solution, sodium chloride solution, etc. If fever occurs, symptomatic hypothermia treatment is needed, which can be physically cooled down or medication can be applied to lower the temperature. It is recommended to go to a regular medical institution to be able to make a clear diagnosis, and then the appropriate treatment can be carried out under the guidance of the doctor.