What makes a stool smell like rotten eggs?

A stool may smell like rotten eggs primarily due to the presence of sulfur-containing compounds, particularly hydrogen sulfide. This can occur when the digestive system has difficulty breaking down certain foods, such as those high in sulfur (like eggs and cruciferous vegetables), or due to an imbalance in gut bacteria. Conditions like malabsorption or gastrointestinal infections can also contribute to this odor. If the smell persists or is accompanied by other symptoms, it’s advisable to consult a healthcare professional.