Chronic functional disorders of the gastrointestinal system are becoming increasingly common. (magnesium.ca)
That is why the problem of putting your dog to sleep should be always faced bearing in mind the underlying functional disorder (if known). (professorshouse.com)
IBS is a chronic and debilitating functional disorder of the gastrointestinal (GI) tract which affects around 10 - 15 per cent of the western population. (sciencedaily.com)