Identification of risk factors for Parkinson’s disease (PD) is essential for early diagnosis. Dating back to the 1920s, Parkinson’s disease and parkinsonism — an umbrella term that refers to motor symptoms found in Parkinson’s disease and also other conditions — have long been described in boxers. Repetitive head impacts from tackle football can also have long-term neurological consequences like chronic traumatic encephalopathy (CTE). But research on the association between participation in tackle football and PD is limited.