[Constipation in adults: an update].

Constipation affects 2% to 27% of individuals. It is associated to irritable bowel syndrome in 59% of cases, to a pelvic floor dysfunction in 29% and to a low transit time in 13%. During assessment of patients with constipation the effects of medications and chronic diseases must be discarded and the ideal is to determine which type of functional disorder it present. An algorithm for the management of chronic idiopathic constipation, that includes a recommendation to increase fiber and liquid intake as an initial approach and an orientation to the use of different laxatives, is presented. The usefulness of biofeedback in patients with pelvic floor dysfunction and without organic cause of constipation, is also discussed.