Trey Fearn, 15, struggled for months after suffering two concussions playing football and basketball.
"I'd get nauseous, I'd get headaches, I'd think and I'd try to sit down and focus but I just couldn't do it," Fearn said.
A new report from the Institute of Medicine says there's a lot we don't know about the impact concussions have on children. The group is recommending a national system to better track the problem.
"There is a culture of resistance when it comes to reporting concussions. Because you can't see a concussion, people hide their symptoms because they don't want to let their teammates or their parents or their coaches down," said Dr. Neha Raukar, a Committee Member from Brown University. "Sometimes it's because athletes don't recognize symptoms as a concussion."
Football, ice hockey, lacrosse, wrestling and soccer are associated with the highest rate of concussions in boys. For girls, it's soccer, lacrosse and basketball. The panel finds little evidence helmets prevent concussions. "A helmet can block some of the force but can't stop your head from moving," said Dr. Christopher Giza with UCLA.
Trey's doctors told him to give up football and give his brain time to heal. "Not going out too much, not watching TV, just letting my mind relax," Fearn said. Now he's focused on playing baseball.
Teresa Garcia - CBS News
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