Tympanites is the medical term for abnormal distension of the abdomen with gas — from the Greek tympanon, drum, for the drum-like sound the swollen belly makes when tapped. Also called meteorism, it results from excessive gas in the stomach or intestines, whether swallowed, produced by bacterial fermentation of undigested food, or trapped by obstruction or sluggish motility. The distension causes discomfort, pain, and visible swelling. In food contexts it follows overeating, very gassy foods such as beans and crucifers in sensitive individuals, or fizzy drinks; pathologically it signals obstruction, ileus, or malabsorption. Treatment addresses the cause, from dietary adjustment to urgent surgery for obstruction. It is a symptom, not a disease.