Test your knowledge about concussions. Correct answers are at the bottom of the Center for Concussion Care page.

* 1. Most sports-related concussions are never diagnosed because athletes may not recognize or report the symptoms of concussion.

* 2. Among people who are 15 to 24 years old, the major cause of traumatic brain injury is sports.

* 3. Annually, ____ million children and adults in the United States experience a sports-related concussion.

* 4. What concussion symptoms are often observed by parents or guardians? (Check all that apply)