What can happen if the large intestine isn't functioning properly?

Colon dysfunction. The colon's primary function is absorption of water (mostly right colon) & storage of solid waste (mostly left colon). Continence of stool relies primarily on rectal tone & sensation. An inflammed colon or one that is too active may result in diarrhea, whereas a sluggish colon may contribute to constipation. Fecal incontinence reflects rectal/anal disturbance (see my earlier healthtap entries).