What are the causes of bowl obstruction?

Hernia tumor adhesio: Most bowel obstructions are postoperative and related to adhesions (scar tissue) or postoperative hernia. Sometimes people with groin hernias or umbilical hernias will have a bowel obstruction and occasioanlly it can be caused by appendicitis or gallstones. Most of the remainder are due to a tumor blocking part of the intestine. Ileus is a nonmechanical obstruction'like picture that can mimic.