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FULL STORY. Hydrogen sulfide is a foul-smelling gas with an odor resembling that of rotten eggs. Sometimes called swamp gas, this toxic substance is generally associated with decaying vegetation, sewers and noxious industrial emissions.
Quick Answer. According to a Mayo Clinic article appearing on CNN, burps that smell like rotten eggs are caused by hydrogen sulfide gas produced as food passes through the digestive system. Hydrogen sulfide in the gas can make it taste and smell like sulphur or rotten eggs.