Elastic band ligation device for treating hemorrhoids and treatment method are provided. The device includes an inner tubular member for retaining an elastic band over the front end. The inner tubular member is arcuate and is insertable into the rectum of a patient. A plunger in the tubular member when pulled generates a suction for drawing hemorrhoidal tissue into the inner tubular member through the front end. A plastic outer tubular pusher sleeve has an arcuate configuration corresponding to the arcuate inner tubular member to provide a limited friction fit over the inner tubular member. The pusher sleeve has a thumb pusher to allow the outer tubular pusher sleeve to be pushed towards the front end of the inner tubular member and release the elastic band from the front end of the inner tubular member to engage hemorrhoidal tissue extending through the opening in the inner tubular member.
