Passive Fecal Incontinence: If a person's sphincter muscle is not functioning properly, the person may pass stool and not even realize it.
Urge Incontinence: Caused by disease in the rectum. The person may involuntarily pass stool through a normal sphincter muscle.
Several studies are performed in the study of fecal incontinence, including endorectal utrasonography, lower endoscopy, and defecography. Your physician will determine the best study for you during the consultation.