Diverticula are small pea or grape sized, sac-like protrusions that develop in the lower part of the large intestine, or colon, and project into he abdominal cavity. They typically form if an indivi

The reason pouches (diverticula) form in the colon wall is not completely understood. Doctors think diverticula form when high pressure inside the colon pushes against weak spots in the colon wall.