Steve Wozniak, co-founder of Apple, had a stroke.

According to reports, Apple co-founder Steve Wozniak was rushed to a hospital in Mexico City on Wednesday after possibly having a stroke.

CNBC said the 73-year-old physicist and software entrepreneur was going to be at a World Business Forum event in Mexico City’s Santa Fe area.

After Wozniak finished speaking at the gathering, he reportedly told his wife that he was “feeling strange.”

His wife was adamant that he should be checked out, so he did. While the specifics are sketchy at best, TMZ speculated that Wozniak had vertigo, a disorder marked by dizziness and balance issues.

Wozniak co-founded Apple Computer with the more well-known Steve Jobs in 1976; Jobs was an investor and Apple’s CEO until his death in 2011.

its firm was one of the first to mass-produce personal computers, and today it is the most valuable in the world, thanks to the success of its innovative products like the iPod, iPad, and iPhone.