1 year old with anger problems?

My nephew is one years old, he has to be the cutest lil boy I've ever seen! How ever his anger is that of a 30 year old man!!!!! He gets so upset for the simplest things he throws stuff, hits ppl, bites, only when he's mad!

Is it a sign of a anger disorder of some sort at such an early age?

Is it bad to let him "just release his anger"?

Will allowing him to do so have affects on his anger getting worse as he gets older?

Is it normal for a 1year old to have anger problems this severe?