Post-concussion syndrome
About 10% of people with PCS develop sensitivity to light or noise, about 5% experience a decreased sense of taste or smell, and about 14% report blurred vision. People may also have double vision or ringing in the ears, also called tinnitus. PCS may cause insomnia, fatigue, or other problems with sleep.
Concussions in sport
The National Hockey League's concussion policy began in 1997, and players who sustain concussions are evaluated by a team doctor in a quiet room. In March 2011, the NHL adopted guidelines for the league's concussion policy. Before the adoptions, examinations on the bench for concussions was the minimum requirement, but the new guidelines make it mandatory for players showing concussion-like symptoms to be examined by a doctor in the locker room.