That's a real bummer. He's a guy who's really well-liked by the community; he's always kept a low profile, staying humble and sharing educational content. I couldn't find anything specific online about his health issue, so I asked ChatGPT, and this is what it told me:
What health issues does he have?
He has chronic, severe migraines
They’ve been described as debilitating and difficult to treat
He’s said he has tried many treatments without much success
These aren’t just normal headaches—severe migraines can:
knock you out for hours or days
affect vision, speech, and concentration
make regular work (especially public speaking, screens, travel) very hard
Impact on his work
Because of this:
He has paused livestreams and new content creation
Reduced public appearances and conference activity
Focused more on existing material instead of producing new stuff
About rumors (important)
Some people speculated about rare neurological conditions, but he hasn’t confirmed anything beyond migraines