It is perfectly normal that along with the ingestion of food, some air is ingested as well. It is also completely normal to belch this excess gas as a way to decrease tension in the stomach and abdomen. However, it is abnormal to experience prolonged and sustained eructation. Additionally, the interplay between digestive secretions and intestinal fermentation of patients with IBS is abnormal, and as such, it is common to expel gas through the rectum excessively. To treat flatulence, various therapeutic measures can be used depending on the case.