Not every individual who has migraines will experience a headache when exposed to these triggers. If a person is unsure what his or her specific triggers might be, maintaining a headache diary can be beneficial to identify those individual factors which lead to migraine.
Football and ice hockey were the organized sports with the most concussion injuries, and snow skiing, bicycling, and playground injuries accounted for the most concussions occurring from non-team-related activities.
It can also result from being hit in the head with a piece of sporting equipment. In a sport such as soccer, even heading the ball can cause a concussion. A concussion causes an alteration of a person's mental status and can disrupt the normal functioning of the brain.