111 NFL players' brains were examined. All but 1 had CTE.

Of the 111 brains of deceased NFL players examined in a study published Tuesday in The Journal of the American Medical Association, all but one of the brains showed signs of the neurodegenerative brain disease chronic traumatic encephalopathy (CTE). The disease, found in 110 of 111 NFL players' brains donated for scientific research, is "linked to repeated blows to the head," The New York Times reported. Symptoms of CTE, which can only be diagnosed with an autopsy, include memory loss, confusion, and depression.
The players whose brains were examined spanned every position, from quarterbacks to running backs to linemen. Some players, such as Hall of Famer Ken Stabler, were particularly famous, while others were lesser known. In addition, high school and college players' brains were examined; CTE was found in three of 14 high school players' brains and 48 of 53 college players'.
Neuropathologist Ann McKee warned that there's "a tremendous selection bias" in the study's sampling of brains because the families that donated the brains oftentimes did so because they suspected symptoms of CTE. However, McKee noted the "fact that we were able to gather this many cases" in just the past eight years suggests the disease is "much more common than we previously realized."
Subscribe to The Week
Escape your echo chamber. Get the facts behind the news, plus analysis from multiple perspectives.

Sign up for The Week's Free Newsletters
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
McKee acknowledged that it's still not clear "what the incidence is in the general population or in the general population of football players," but she said one thing is clear: "It is no longer debatable whether or not there is a problem in football — there is a problem."
A free daily email with the biggest news stories of the day – and the best features from TheWeek.com
-
Japan's surname conundrum
Under the Radar Law requiring couples to share one surname hinders women in the workplace and lowers birth rate, campaigners claim
-
How successful would Elon Musk's third party be?
Today's Big Question Musk has vowed to start a third party after falling out with Trump
-
Music reviews: Bruce Springsteen and Benson Boone
Feature "Tracks II: The Lost Albums" and "American Heart"
-
IAEA: Iran could enrich uranium 'within months'
Speed Read The chief United Nations nuclear inspector, Rafael Grossi, says Iran could be enriching uranium again soon
-
One year after mass protests, why are Kenyans taking to the streets again?
today's big question More than 60 protesters died during demonstrations in 2024
-
Iran nukes program set back months, early intel suggests
Speed Read A Pentagon assessment says US bombing of Iranian nuclear sites only set the program back by months, not years. This contradicts President Donald Trump's claim.
-
Trump says Iran and Israel agreed to ceasefire
Speed Read This followed a night of Israeli airstrikes on Tehran and multiple waves of missiles fired by Iran
-
Israel strikes Iran, killing military and nuclear chiefs
Speed Read Israeli officials said the attack was a 'preemptive' strike on Iran's nuclear program
-
Israel deports Thunberg after seizing Gaza aid boat
speed read The Swedish activist was delivering food and medical aid to Palestine, highlighting the growing humanitarian crisis there
-
Colombian senator shot on streets of Bogotá
speed read Miguel Uribe Turbay, who has announced his candidacy for next year's presidential election, was shot at a rally
-
Trump says Putin vowed retaliation for Kyiv strike
speed read The Russian president intends to respond to Ukraine's weekend drone strikes on Moscow's warplanes