“…The influence of mental state, such as short-term anxiety and stress, also impact on bowel habit. Furthermore, it is well known that stool ''withholding'' behavior, often triggered by an instinct to avoid painful evacuation, is one of the main causes of defecatory dysfunction in children [21][22][23]. Two separate studies have reported that up to 97% of constipated children display stool withholding behavior [24,25].…”