The intestinal bacteria will produce intestinal gas during the digestive process. Gases are formed in the intestines which may lead to stomach indigestion and bloating. When there is stomach flatulence, there is sometimes cramping which leads to intestinal gas and stomach belching.Some may believe that swallowed air is the reasoning behind stomach flatulence.ases are formed in the intestines which may lead to stomach indigestion and bloating. When there is stomach flatulence, there is sometimes cramping which leads to intestinal gas and stomach belching. Some may believe that swallowed air is the reasoning behind stomach flatulence.