Although most people who
suffer a concussion experience initial bouts of dizziness, nausea, and
drowsiness, these symptoms often disappear after a few days. The
long-term effects of concussions, however, are less understood and far
more severe. Recent studies suggest that people who suffer
multiple concussions are at a significant risk for developing chronic
traumatic encephalopathy (CTE), a degenerative brain disorder that
causes a variety of dangerous mental and emotional problems to arise
weeks, months, or even years after the initial injury.