Flatulence

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Flatulence can be embarrassing, but it is a common problem and affects everyone at some point. Flatulence is often referred to as passing or breaking wind, and occurs when you need to expel the excess air that builds up in your body throughout the day.
The gut (the long muscular tube that stretches all the way from your oesophagus â€“ or gullet â€“ to your rectum) contains a lot of gases, mainly:
nitrogen and oxygen â€“ taken into the body through the mouth during eating and talking
carbon dioxide â€“ produced when the acid present in the stomach comes into contact with bile and juices from the pancreas

hydrogen and methane â€“ produced when the bacteria in the colon starts to ferment the residues delivered from the small intestine.

Much of this gas is absorbed into the blood and will be breathed out in due course. The rest is passed out through the rectum.