Why do farts smell like eggs?

Farts do not usually smell like eggs. The smell of farts is typically caused by the presence of compounds such as hydrogen sulfide, methanethiol, and dimethyl sulfide. These compounds are produced when bacteria in the colon break down undigested food. The smell of eggs is typically caused by the presence of hydrogen sulfide, which is also one of the compounds that can cause farts to smell. However, the concentration of hydrogen sulfide in farts is typically much lower than the concentration of hydrogen sulfide in eggs, which is why farts do not usually smell like eggs.