Swallowing air, known as aerophagia, can also be a major cause of abdominal pain, and may also lead to a swelling of the abdominal area, as well as frequent belching.    From Wordnik.com.  [xml's Blinklist.com] Reference

Pardon had told him not to worry about it, it was just aerophagia.    From Wordnik.com.  [Maigret on the Defensive]

There are many causes of abdominal bloating, including overeating, excessive gas buildup, lactose intolerance, a food allergy, air swallowing (aerophagia), irritable bowel syndrome (which affects the lower gastrointestinal tract), hernia, premenstrual syndrome (PMS), partial bowel obstruction, constipation, menstruation, diverticulosis and pregnancy.    From Wordnik.com.  [eHow - Health How To's] Reference