When I'm really mad I sometimes see red is that normal?
does this happen to other people?
It does happen to other people, but it is not normal. It means you have anger issues, and need to seek professional help.
It can mean a heart condition. Getting angry can put stress on the heart and cause hallucinations of colors due to lack of oxygen to the brain. You may want to get checked.Good luck! : D
Not so uncommon. When your blood pressure is highly elevated, capillaries can expand or even leak a little, into the back of the eye, and can give the world a reddish cast.