<unk>  is a form of<unk>  with a psychological or psychosomatic background. A person suffering from it is physiologically healthy, but still experiences trouble defecating.<unk>  is medically defined by the Rome III criteria.
Functional constipation
Fecal incontinence
Fecal impaction
Anal dysplasia
Irritable bowel syndrome
Purging disorder
Rectal prolapse
Functional gastrointestinal disorder