Why do you get involuntary bowel movements? what causes this?

Fecal incontinence?: Occasional incontinence of stool with fecal leakage is common, but loss of bowel control particularly without warning may signal a significant infection, inflammatory problem, maldigestive concern, or neurologic disorder. Sometimes, particularly in youths, the condition is behavioral. Often, anal manometry followed by biofeedback can be curative without the need of surgery or medication.