By WebMD
Rumination disorder (also called merycism) is an eating disorder in which a person -- usually an infant or young child -- brings back up and re-chews partially digested food that has already been swallowed.
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Post-traumatic stress disorder (PTSD) and eating disorders often co-occur. People with eating disorders may have other mental health conditions, such as generalized anxiety disorder, social anxiety disorder, or obsessive-compulsive disorder (OCD).