CTE symptoms tend to appear in two phases. Early signs, often emerging around age 40, include headaches, confusion, disorientation, dizziness, short-term memory loss, impulsivity, and erratic behavior. Later signs, typically around age 60, include aggression, paranoia, depression, suicidal thoughts, dementia, movement disorders, and difficulties with speech. The symptoms vary from person to person and overlap with other conditions, which makes CTE easy to miss.