6. Johnny Cash Had a Neurodegenerative Disease
In 1997, doctors misdiagnosed Cash with Parkinson’s. The diagnosis was changed to a form of multiple-system atrophy called Shy-Drager syndrome, and he was given 18 months to live. The diagnosis was changed again to autonomic neuropathy, a degenerative illness associated with his diabetes. After he collapsed on stage during a concert, he had to stop touring so much.