Medical treatment apparatus, method for operating medical treatment apparatus, and treatment method

This medical treatment apparatus 1 includes: a pair of holding members that clamps body tissue; an energy generation unit 22 that is provided on at least one of the pair of holding members and generates energy; a distance calculation unit 321 that calculates the distance between the members of the pair of the holding members; and an energy control unit 322 that causes the energy generation unit 22 to generate energy corresponding to the distance between members.