About 34% football players believe they have a degenerative brain disease known as chronic traumatic encephalopathy (CTE) and of those players, 25% reported having suicidal thoughts, according to a new report published in the medical journal JAMA Neurology.

About one-third of nearly 2,000 retired NFL players believe they have chronic traumatic encephalopathy (CTE), a degenerative brain condition linked to repeated head trauma, researchers reported Sept.

A Harvard study of almost 2,000 former National Football League players revealed that about one-third believe they have chronic traumatic encephalopathy, a degenerative brain disorder linked to repeated head impacts.

One-third of former NFL players believe they suffer a condition resulting from repeated head trauma, according to a survey conducted by Harvard University and published on Monday by JAMA Neurology. Chronic traumatic encephalopathy,

The degenerative brain disease can only be diagnosed after death. But hundreds of retired players reported symptoms linked to CTE, like depression, mood swings and suicidal thoughts.

About 35% of 1,980 retired professional football players who participated in a survey said they believe they have CTE, Harvard University study finds.