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A concussion results from a closed-head type of injury and does not include injuries in which there is bleeding under the skull or into the brain. Other signs of concussion include convulsions, ringing in the ears and slurred speech. Much of the experience in caring for mild head injuries comes from the treatment of sports injuries. Concussions are graded as mild (grade 1), moderate (grade 2), or severe (grade 3), depending on such factors as loss of consciousness, amnesia, and loss of equilibrium.
Although we usually hear about head injuries in athletes, many occur off the playing field in car and bicycle accidents, in fights, and even minor falls. Someone with a concussion may lose consciousness, but this doesn’t happen in every case.