Multiple small retroperitoneal lymph nodes refers to multiple enlarged lymph nodes found in the retroperitoneum on imaging, such as ultrasound or CT. There are many causes of multiple small retroperitoneal lymph nodes, the common ones include viral infection, bacterial infection, tuberculosis infection, hematologic disease, autoimmune disease, lymph node metastasis of malignant tumors and so on. In addition to ultrasound, CT and other imaging tests, you can also perform various laboratory tests, the specific treatment needs to be confirmed after diagnosis under the guidance of the doctor. It is recommended that patients avoid getting cold in daily life, avoid spicy and stimulating food to aggravate the condition, eat more fresh vegetables and fruits, drink water appropriately, and follow the doctor’s instructions for regular checkups and follow-ups.