Former NFL player Brett Favre announced this week that he's been recently diagnosed with the condition. Here's what you should know, according to experts.

The retired N.F.L. quarterback Brett Favre told a congressional committee on Tuesday that he had been diagnosed with Parkinson’s disease, a progressive, incurable condition that causes tremors and stiffness,

Research suggests that concussions from football can raise the risk of Parkinson’s and other neurodegenerative diseases.