"Constipation or Irregularity, is a condition of the digestive system where a person (or other animal) experiences hard feces that are difficult to eliminate; it may be extremely painful, and in severe cases (fecal impaction) lead to symptoms of bowel obstruction. Causes may be dietary, hormonal, a side effect of medications, and anatomical. Treatment is with a change in dietary habits, laxatives, fiber therapy, enemas, and rarely surgery."