Unless you have experienced a concussion, you can’t really understand how bad it can be.

A concussion happens when your brain gets rattled in your skull. Just think about that for a minute, does it sound pleasant?

Eagles trainer Rick Burkholder breaks down all of Vick’s symptoms. I wouldn’t expect him back for awhile.

• Still can’t drive a car due to balance issues.

• Sleeps all day, can’t sleep at night.

• Lethargic.

• Nauseous.

• Can’t sit in meetings.

• Sensitive to light.

“He just isn’t right,” Burkholder said.