A tissue treatment method combined with a bypass procedure of a hollow organ includes a first process of dividing the hollow organ into a first region of a distal side of the hollow organ and a second region of a proximal side of the hollow organ, a second process of forming a damaged part of a predetermined size on an outer surface of at least one of the first and second regions, and a third process of fixing the first and second regions such that the damaged part is kept in close contact with an outer surface of the other of the first and second regions.
