Concussion tells the story of how a Pittsburgh pathologist's research led to the discovery of chronic traumatic encephalopathy - CTE, the degenerative disease linked to repetitive brain trauma.
CTE can cause chronic headaches, dizziness and fatigue. Changes in behavior mimic dementia. The disorder also raises the risk for depression and abuse of alcohol and drugs. Several NFL players depicted in the movie committed suicide.
Movies often oversimplify complex medical issues. To fact-check this one - to measure the accuracy of how it shows the symptoms and science of CTE - we accompanied an expert to the cinema.