A case of colonic varices manifesting with rectal bleeding in a young patient is presented. There was no evidence of portal hypertension or any other cause. Familial history was also negative. Diagnosis was established by barium enema, colonoscopy and angiography. On colonoscopy, varices involved the entire colon. At operation, dilatation of the subserosal small veins of the entire small and large bowel was confirmed. The patient underwent a subtotal colectomy with ileorectal anastomosis with satisfactory result.