Aerophagia
Swallowing too much air, a common cause of gas in the stomach and belching.
Everyone swallows small amounts of air when eating or drinking.
However, rapid eating or drinking, chewing gum, smoking, or ill-fitting dentures may cause a significant increase in swallowed air.
The word 'phage' in Greek means 'to eat.' Aerophagia is literally to eat air.