It depends on the situation. I have worked places that pool all leave time into one pool of "paid time off". It doesn't matter what it's for: vacation, out sick, whatever, it all comes from the same pool. In those cases, I have to be knock, knock, knockin' on death's door to miss a day. I hate burning potential personal vacation time to be out sick. If I have dedicated sick time, then I will use it.
Something is wrong with your country.