Chronic traumatic encephalopathy (CTE) is a progressive brain condition that's thought to be caused by repeated blows to the head and repeated episodes of concussion. It's particularly associated with contact sports, such as boxing or American football. Most of the available studies are based on ex-athletes.

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The symptoms of CTE include memory loss, confusion, impaired judgment, impulse control problems, aggression, depression, anxiety, suicidality, parkinsonism, and, eventually, progressive dementia. These symptoms often begin years or even decades after the last brain trauma or end of active athletic involvement.

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Doctors and Specialists suggest not placing people with CTE in any position that requires them to make crucial life decisions for more than, oh I dunno, more than one person.