The authors describe their experience with colo-rectal haemorrhage. They stress the tendency towards spontaneous arrest of such haemorrhages (92.6% of cases) as the usefulness of emergency colonoscopy in diagnosing the cause and/or site of the haemorrhagic lesion (85.7% of positive results in the present series). Therapy may be conservative (endoscopic or in the course of angiography) or surgical. Surgery is indicated in cases failing to respond to conservative therapy and in cases of unarrestable haemorrhage and usually consists in segmental resection of the portion of the intestinal tract involved.