Most of the time, both athletes continue playing without a problem. But once in a while, the force is enough to cause dizziness or a headache.
Some concussions can even be life threatening.
Concussions are an agitation of the brain. When you hit your head, small tears can occur between the brain and it's surrounding membranes and blood vessels. When this happens, symptoms can range from dizziness and momentary confusion to an extended loss of consciousness. The extent of the symptoms determines the grade of concussion - mild to severe. The following is a list of acute signs associated with a head injury.