Rumination in infants and young children has been described extensively in the literature. More recently, reports have appeared on rumination in adults in association with bulimia nervosa, but not with anorexia nervosa. The authors describe two cases in which rumination could have been easily overlooked had a line of questioning not been pursued that facilitated establishment of the diagnosis. The significance of the association of rumination with bulimia nervosa, and the possible complications, are further discussed.