What is chronic traumatic encephalopathy?

Published On: May 06 2012 04:48:36 PM PDT   Updated On: Mar 17 2015 07:57:27 AM PDT

Find out more about chronic traumatic encephalopathy, the disease several former NFL pros claim they are now suffering from due to hits on the field.

Chris Borland, November 2014
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Al Bello/Getty Images

San Francisco 49ers linebacker Chris Borland announced his retirement from football on March 16, 2015, due to worries about head trauma. The team's leading tackler in the 2014-15 season as a rookie, Borland told ESPN that even though he was diagnosed with only two concussions, both while in high school, he will not change his mind about retiring.

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