This occurs when the waste resists water loss (lactose intolerance and some forms of laxatives) or when the functionality of the bowel lining is compromised (food poisoning and infection).
Hii hutokea wakati taka kuyapinga upotevu wa maji (kutovumilia lactose na aina fulani ya laxatives) au wakati utendaji wa bowel bitana ni kuathirika (sumu ya chakula na maambukizi).