Multiple lymph node echoes in the abdominal cavity, larger 9mmx4mm, may be caused by physiological factors, usually occurring in children; it may also be acute lymphadenitis, abdominal lymph node tuberculosis, metastasis of malignant tumors and so on. 1. Physiologic factors: young children, including children before the age of ten, have multiple lymph node echoes in the abdominal cavity as the lymphatic system is in a stage of rapid development. It is possible to see multiple lymph node echoes in the abdominal cavity. Generally no special treatment is needed, and the symptoms will disappear automatically after adulthood. 2. Acute lymphadenitis: Bacterial and viral infections in the abdominal cavity can lead to acute lymphadenitis in the abdominal cavity, most commonly seen in children with respiratory infections, and multiple lymph nodes may be present, which will improve significantly after treatment of the primary disease. 3. Tuberculosis of abdominal lymph nodes: at the beginning, there will be no discomfort, but in the later stage, there will be abdominal pain, and the lymph nodes are often adhered to the surrounding tissues, often accompanied by low-grade fever, night sweats and other systemic symptoms. 4. Malignant tumor metastasis: malignant tumors of the digestive tract can often lead to lymph node enlargement in the abdominal cavity through lymphatic metastasis. Multiple lymph node echoes can be seen in the abdominal cavity, and there may be other reasons, such as lymphoma, etc. It is recommended to improve the examination as soon as possible to find the cause of the disease, and actively treat it if necessary.