Concussions are the most common type of head injury. Some studies report that as many as 4 million concussions occur each year, with almost 10 percent of young athletes reporting that they have experienced signs and symptoms. Over the past few years, doctors and coaches have spearheaded a campaign to spread awareness of the problem and its prevention.
A concussion is defined as any alteration in consciousness due to an impact to the head. Whereas it was once believed that a loss of consciousness was necessary to define a concussion, we now know that having your "bell rung" or "seeing stars" are actually concussions as well.