Small retroperitoneal lymph node enlargement and diarrhea are two symptoms of intestinal inflammation and other diseases, and there is no causal relationship. Retroperitoneal lymph node enlargement is usually an enlargement of the lymph nodes in the area between the back wall of the abdomen and the posterior peritoneum, which can be caused by lymphatic tuberculosis, lymph node inflammation, malignant tumors, and so on, and it is necessary to consult a doctor in time after discovery for a clear diagnosis and treatment. Diarrhea is the number of bowel movements significantly more than the usual frequency, can also be accompanied by anal discomfort, incontinence and other symptoms, can be caused by intestinal infections, poisoning, medication and other factors, need to clarify the causes of diarrhea, according to the cause of treatment. Retroperitoneal lymph node enlargement and diarrhea are both symptoms that can occur in the same disease, such as chronic colitis, but there is no such thing as retroperitoneal lymph nodes can cause diarrhea.