Bloating is a sensation of ‘fullness’ and tightness within the abdomen. It may be accompanied by swelling of the abdomen (distention). Bloating (Abdominal distention) often results from overeating or from swallowing air. However, it can also be a sign of a more serious medical condition such as bowel obstruction. Eating certain foods such as legumes (beans) can cause abdominal distention due to intestinal gas. This may occur with ingestion of dairy products by persons who are lactose intolerant. Bloating due to build-up of gas within the gastrointestinal is often relieved by belching or flatulence.