Why are rotten eggs so smelly when they go bad?

Rotten eggs are particularly smelly due to the presence of hydrogen sulfide gas, which is produced when the proteins in the egg white and yolk break down. Bacteria decompose the organic matter in the egg, releasing this gas, which has a characteristic foul odor reminiscent of rotten eggs or sewage. Additionally, other compounds formed during decay can contribute to the unpleasant smell. The strong odor serves as a natural warning sign, indicating that the egg is no longer safe to eat.