A concussion is a brain injury.
You might not have a bruise on your head or a cut that’s gushing blood, but it’s an injury just the same. In fact, it can be even more serious than those other injuries. That’s because you might feel fine a couple minutes, hours, or days later, but the effects can last much longer.
So, let’s say you get injured in a game. You take a fall and hit your head hard against the field. You get a little...