Probably I have a concussion, because I fall asleep for a while.

The laceration on your forehead isn't serious, but you do have a concussion.

Sometimes you can have a concussion and not even know it.

Since he does have a concussion history, he is doubtful for this week's game.

Nothing serious-butI guess I have a concussion or something.

You should probably get checked out, but I don't think you have a concussion.

You might have a concussion, but you're feverish, as well.

She might have a concussion, but he didn't think it would be a major one.

Your jaw is broken and you have a concussion.

Mom was worried that I might have a concussion.

Mitch made sure I didn't have a concussion.

You have a concussion at the very least.

Don't fall asleep if you have a concussion?

You're lucky you don't have a concussion.

He's lucky not to have a concussion.

Poor thing was practically out cold, and he did not break his nose, or have a concussion.