As the film is an adaptation of the comics, we can say it is assumable that Joker in the film also depicts his inherent ability to withstand extreme pain and return a fight. It is his innate quality and skill.
Due to his will to be an agent of chaos, he is able to endure severe physical pain better than most humans. This does not exclude him from pain however as is shown especially during the interrogation scene, the Joker is physically injured by Batman's strength, unable to fight back.
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ContoThe Joker is a supervillain who appears in American comic books published by DC Comics. The Joker was created by Bill Finger, Bob Kane, and Jerry Robinson and first appeared in the debut issue of the comic book Batman on April 25, 1940. Credit for t...