Umbilical hernias rarely cause diarrhea in patients. An umbilical hernia mainly occurs because the umbilical ring is not completely closed, allowing parts of the small intestine or omentum to enter under the skin at the belly button, forming a noticeable bulge. The most common symptom caused by umbilical hernias is intestinal obstruction, which presents as abdominal pain. This mainly occurs when the small intestine becomes trapped in the umbilical ring and cannot easily retract, which rarely leads to symptoms of diarrhea. If a patient experiences diarrhea, further medical examination at a hospital is necessary to determine if it is caused by other reasons.