Besides aggression and irritability, depression is a symptom of CTE. Sadness is commonly associated with depression, but another personality change is the feeling of apathy. This means you feel indifferent to things or do not really care. The loss of interest is a sign of depression and, therefore, CTE. These feelings may lead to suicidal thoughts or behaviors. If you have thoughts of harming yourself or others, then seek local emergency care or call the National Suicide Prevention Lifeline at 800-273-TALK (800-273-8255).

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