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Flatulence, also called fart or flatus, is when intestinal gas leaves the anus. This often happens with a sound.

In mammals like humans, the gases come from two sources: swallowed air (for example, while eating, talking or drinking) and gases naturally created by bacteria in the body during digestion. Nitrogen is the main gas released (20-90% in total), followed by hydrogen, carbon dioxide, oxygen and methane.