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Kit Parker's Story Part I

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Most people who say they've had a concussion say they sought out medical care at the time. Science Photo Libra/Getty Images hide caption

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Science Photo Libra/Getty Images

Poll: Nearly 1 In 4 Americans Reports Having Had A Concussion

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Months after a concussion or other traumatic brain injury, you may sleep more hours, but the sleep isn't restorative, a study suggests. iStockphoto hide caption

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A Concussion Can Lead To Sleep Problems That Last For Years

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Dr. Bennet Omalu speaks on stage during the 2015 Health Hero Awards hosted by WebMD on Nov. 5 in New York City. Bryan Bedder/Getty Images hide caption

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Bryan Bedder/Getty Images

Doctor Behind 'Concussion' Wanted To 'Enhance The Lives' Of Football Players

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Evans Army Community Hospital, which stands on the Fort Carson military base, is a central part of the base's behavioral health system. Courtesy of Evans Army Community Hospital/U.S. Army hide caption

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Courtesy of Evans Army Community Hospital/U.S. Army
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Concussions Can Be More Likely In Practices Than In Games

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San Francisco 49ers linebacker Chris Borland, center, during an NFL football game in Santa Clara, Calif. Borland announced that he will retire after just one season to protect himself from brain injuries. Marcio Jose Sanchez/AP hide caption

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Marcio Jose Sanchez/AP

'Borland Effect' A Fumble For Football? Deford Says It Will Pass

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Football rules, uniforms, helmets and protective gear have changed a lot over the years. Keystone-France/Gamma-Keystone via Getty Images hide caption

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Keystone-France/Gamma-Keystone via Getty Images

Why Do We Love Football So Much? Theater Tackles Tough Questions

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Lt. Gen. Mark Milley speaks to reporters April 2 regarding the second shooting in five years on the Fort Hood Army post in Texas. Drew Anthony Smith/Getty Images hide caption

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Drew Anthony Smith/Getty Images

Researchers have only recently been able to use brain scans to detect Alzheimer's risk factors in living people. iStockphoto hide caption

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Kansas City Chiefs linebacker Jovan Belcher's body has been exhumed more than a year after he killed his girlfriend and himself so that his brain can be examined for signs of a degenerative condition linked to repeated concussions. Seth Perlman/AP hide caption

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Seth Perlman/AP

Dartmouth defenders sandwich a New Hampshire wide receiver during a game in Durham, N.H., in 2009. Josh Gibney/AP hide caption

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Josh Gibney/AP

Hospital intensive care units save lives, but people there often suffer from delirium. Cal EMA / Flickr hide caption

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Cal EMA / Flickr

The cause of strokes in younger people remains largely a mystery. iStockphoto.com hide caption

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iStockphoto.com

Dr. Ann McKee, professor of neurology and pathology of Boston University School of Medicine and co-director of the Veterans Affairs Center for the Study of Traumatic Encephalopathy, inspects a brain in the Bedford Veteran Medical Center last year. Stan Grossfeld/Boston Globe via Getty Images hide caption

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Stan Grossfeld/Boston Globe via Getty Images

Sgt. Victor Medina suffered brain damage in 2009 when a roadside bomb exploded in Iraq. Blake Gordon/Aurora Photos hide caption

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Blake Gordon/Aurora Photos