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.
The organization she heads includes some members who have worked for N.F.L. teams; most have not, she said. The Boston lab, which has amassed the largest C.T.E. brain bank in the world, contends that anyone playing a head-jostling sport like football, hockey, rugby or soccer runs some level of risk, and that it is cumulative exposure to head hits, not only concussions, that is most critical.