Chronic traumatic encephalopathy

Chronic traumatic encephalopathy (CTE), formerly known as dementia pugilistica, is a neurodegenerative disease found in people who have had multiple head injuries. 
Symptoms may include behavioral problems, mood problems, and problems with thinking. This typically does not begin until years after the injuries. It often gets worse over time and can result in dementia. It is unclear if the risk of suicide is increased.