Yes. Mixed Martial Arts began as a combat training method for hand to hand combat, it is very physically demanding and involves both violent impact from kicking and hitting and intensive muscular control from the Wrestling aspects. Recent article regarding MMA injuries is linked.
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It can be if you go out unprepared and ready to get knocked out but if you train it will be less dangerous and you can win and lose a fight without even landing a punch by submitting them in some ways it is harmless but they do have doctors there so if you get cut and it looks bad they will stop the fight.
Its not really violent because what violence is undisciplined and not well trained people fighting. Compare to other sports boxing, football, etc. they are all violent.