There are two major causes of flatulence. Firstly, flatulence happens due to the air that we swallow while eating or drinking. This air gets trapped into the body and is then released through the intestines. The next and most common cause is digestion. When our bodies digest the food, gas forms in the colon and is then released either as a burp or as flatulence.
Additionally, flatulence can also be due to leftover undigested food, mainly carbohydrates, in our stomach and intestines. Once these carbohydrates reach the colon, the bacteria there ferment them, which results in the production of gas and excessive pressure in the intestines.