<unk>  that lasts for more than 2-4 weeks is considered persistent or<unk> . In an otherwise healthy person,<unk>  can be a nuisance at best or become a serious health issue. For someone who has a weakened immune system,<unk>  may represent a life-threatening illness.<unk>  has many different causes; these causes can be different for children and adults.<unk>  sometimes is classified on whether or not it is caused by an infection. The cause of<unk>  sometimes remains unknown.
Chronic diarrhea
Bloody or tarry stools
Chronic colestites
Constipation in children
Food intolerance
Acute diarrhea
Vulvar pruritus
Fecal incontinence