Is it normal that me and my brother get into fist fights?

I'm only a few years older than my little brother and there have been many arguements where he has pushed me off the deep end. We usually get into serious fist fights that have involved almost breaking my glasses, bruises, bloody lips, and other non life threatening injuries. So far we haven't broken any bones but its getting worse as we get older. To top it off its not even the big things that usually set us off its little things. Is this normal?