Earlier quoted context omitted.
Even better: Sick days shouldn't be a pool at all. In Norway there's X amount of sick days one can use without any hassle (all paid), to use any more all you have to do is show a doctors note. If you have to use more than Y amount of days (chronic illness, a more serious thing or something), the government will temporarily take on the responsibility of paying the worker's wages. I don't think people should be punishe…
In Poland the number of sick days is unlimited but you need a form filled by an actual MD in order to claim it. Vacation days are separate pool.
Sick days should not be a simple pool of days off that you get to treat as equivalent to holiday days. This approach has the effect of (further) rewarding people who are lucky with their health, and incentivises not taking sick days when you should.