Abdominal bloating is a condition in which the abdomen feels uncomfortably full and tight and may be visibly swollen (distended). Bloating is a common complaint, affecting between 10 and 30 percent of adults. Severe abdominal pain and bloating that occur suddenly, especially if you also have nausea and vomiting, may be a sign of a bowel obstruction from scar tissue or a tumor pressing on the bowel.
Bloating, burping and passing gas are natural and are usually caused by swallowed air or the breakdown of food through digestion. The oral diabetes medicine, acarbose, and medicines or foods containing lactulose or sorbitol, may cause bloating.