It is not necessarily obvious when someone has suffered a brain injury, an expert has warned.
Dr Dawn Comstock, an associate professor at Ohio State University, also pointed out that on the other hand it is easy to spot an ankle injury because the individual will be limping, CBSSports.com reported.
"With a concussion, unfortunately, many of the signs and symptoms aren't outwardly apparent to an observer - things like a headache, dizziness [and] nausea," she explained.
In terms of college sport, she believes that the mis-reporting of concussions is fuelled by a two-pronged issue: a culture of machismo among the students, and a lack of awareness among some parents, sports coaches and athletes.
The news source also quotes Dr Stanley Herring, co-director of the Seattle Sports Concussion Program, who stated that youth sports people who experience concussion will take longer to recover than adult professionals.
Meanwhile, the Daily Telegraph's chief sports correspondent has raised the question of whether the Winter Olympics that has just got underway in Vancouver could be the most dangerous Olympics in history.
Ian Chadband stated that athletes are pushing themselves harder than ever to win a medal.
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