When the brain moves around it can hit the inside of the skull and be bruised (“What happens in the brain during and after a concussion”). Concussions can occur even if you aren’t hit directly in the head (“Frequently Asked Questions About Concussions”). Any blow to the body that causes your head to violently snap around can cause your brain to hit the inside of the skull (“Frequently Asked QUestions About Concussions”). When the brain hits the inside of the skull it can alter the balance of ions and chemicals in the brain (“What happens in the brain during and after a concussion”). Different parts of the brain can move at different speeds which can cause painful forces that can stretch and tear nerve tissue (“What happens in the brain during and after a concussion”). Some of the damaged nerve fibers can recover from the injury, but in severe cases the injured nerve fibers can permanently lose their ability to send signals and communicate with other brain cells (“What happens in the brain during and after a