Football legend Brett Favre, 54, announced he has Parkinson’s disease, referencing his diagnosis during a congressional hearing. Favre, who experienced 'thousands' of concussions, highlights a link between head trauma and neurodegenerative disorders. Parkinson’s, a neurodegenerative disorder affecting movement, has no known cause but is linked to age, gender, and head injuries. While there is no cure, symptoms can be managed with medications, lifestyle changes, and therapies.