A progressive brain disease is affecting athletes, especially football players. This condition is caused by repeated head blows. Research on deceased NFL players revealed a significant presence of the disease.

Doctors can only diagnose it after death by examining brain tissue. The examination involves looking for certain markers in the brain. Further information on this condition and its diagnosis is available.

Details about the disease's prevalence among athletes are being studied. A recent study found a notable percentage of NFL players who died had the condition. More details on the research and the condition can be found through the original source.