If your child plays a contact or collision sport, whether at be at the youth, middle school or high school level, odds are that at some point in their athletic career they will suffer a concussion. How well they recover depends a lot on how quickly their concussion is identified so they can be removed from practice or game action.
A lot of student-athletes - a declining percentage, fortunately - don't appreciate precisely when they have suffered a concussion. There are a lot of reasons:
Most athletes won't self-report concussion symptoms to sideline personnel, much less voluntarily remove themselves from the game. Changing the culture is one way to address the problem of chronic under-reporting, but it can't be counted on as a panacea.