acid reflux and some anatomical abnormalities. In infants however, regurgitation - or spitting up - is quite common, with 67% of 4-month-old infants spitting up more than once per day. Chronic, involuntary regurgitation of ingesta following ingestion, commonly known as rumination syndrome, is a rare and often misdiagnosed disorder.

Some people are able to regurgitate without using any external stimulation or drug, by means of muscle control. Practitioners of yoga have