Are There Stages of CTE?
The team of researchers at Boston University, led by neuropathologist Ann McKee, MD, describes four stages of CTE, each marked by further degeneration and, usually, worsening symptoms. For example, people in Stage 1 may experience headaches and struggle to concentrate, while those with Stage 4 may suffer from dementia and show aggression. Hernandez was famously diagnosed with Stage 3 CTE following his death at age 27. The researchers had never seen a case that severe in someone younger than 46 years old.