What is a concussion?
A concussion is an injury to the brain that can cause a variety of symptoms. It's usually caused by a blow to the head, but can sometimes be caused by sudden head movement due to a blow to the body. Most of the time it doesn't involve a loss of consciousness.
Concussion in sports can happen during drills, practices and games. Injuries during practice can be just as serious as those that happen during competition.
Written by familydoctor.org editorial staff