Definition of Rumination disorder:

Rumination disorder is a condition in which a person keeps bringing up food from the stomach into the mouth (regurgitation) and rechewing the food.

Causes, incidence, and risk factors:

Rumination disorder usually starts after age 3 months, following a period of normal digestion. It occurs in infants and is rare in children and teenagers. The cause is often unknown. Certain problems, such as lack of stimulation of the infant, neglect, and high-stress family situations, have been associated with the disorder.

Rumination disorder may also occur in adults.