Headbutt in boxing refers to the intentional or accidental hitting of one fighter's head against an opponent's head, which may or may not result in a cut.
In boxing and other forms of combat sports, headbutting is illegal because it is a devastating form of attack that can cause serious injury. When a headbutt occurs during a fight, the fight may go to the scorecards if it is deemed accidental and the required number of rounds have been completed.
If the headbutt is intentional, it can lead to a disqualification.