It's mostly cultural. In some countries like Germany, Sweden or Netherlands, it's normalized that if you wake up tired or hungover or have a sore throat, you just don't show up at work that day, but in others it's frowned up and your boomer parents and many peers will look at you like you're needlessly weak and avoiding your adult responsibilities by letting a little headache or sniff hold you back from your duties.

That's how you see Eastern Europe actually having much fewer sick days from work despite lower life expectancy and a less performant healthcare system than the west. The communist system and post-communist hardship from the economic collapse meant people had no chance but to work no matter what, if they wanted to eat that day. Not going to work because of a cold or headache or things like depression or burnout was unthinkable to the generation that grew up under those conditions and they perpetuated that mindset to Millennials too. Sick leave was only if something was falling off. That's why Eastern European immigrants who migrated west were so valued for their work ethic. Granted, now thanks to Gen-z things are changing for the better and are adopting the more nordic and ladi back mindset on work ethic.