from CBC,

Spencer Jean is a hockey player who had his career cut short by concussions — 15 of them. His brain is degenerating.

He's been diagnosed with chronic traumatic encephalopathy, a degenerative brain disease.

"My symptoms will just continually get worse over the years. It’ll mock symptoms of dementia," Jean said. "I want to get things accomplished before those symptoms come about."

Now, Jean, 23, has written a book detailing his injuries.

The Untold Truth details his first and last concussions, and everything in between.

Jean, who is from LaSalle, Ont., near Windsor, explains how he hid his concussions from his coaches, teammates, parents and even doctors.

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The book is available at Amazon (affiliate link)