Chronic traumatic encephalopathy is a degenerative condition that affects athletes who receive repetitive blows to the head over time, according to Boston University CTE Center. This condition tends to affect boxers, leading to mild traumatic brain injury.
The symptoms of this condition include thinking difficulties as well as emotional and behavioral changes, and they become visible after several years, states the Mayo Clinic. It is a progressive disease that causes damage to the nerves, leading to visible changes in the brain. Brain imaging helps physicians see some of these changes. As of 2015, diagnosis can only be made after death. There is no cure for this disease because researchers do not fully understand it.