From the article on the Athletic:
After consulting with a series of specialists, Eaves was originally diagnosed with Guillain-Barre syndrome, a rare autoimmune disorder that affects 1 in 100,000 Americans. Eventually, it was determined to be something else altogether.
Just what? Even to this day, the Eaves family doesn’t know for sure. But incredibly, at the end of this long (and still-unsolved) medical mystery, there was finally good news.