The Family and Medical Leave Act protects most (IANAL) employees for up to 12 weeks of unpaid time off per year at the federal level. At some point Americans with Disabilities Act protections kick in and after a few months of a serious illness temporary or permanent disability insurance comes into play.

It's not the dystopia its made out to be but even in the best states the inconsistencies between the layers of protection and myriad of rules cause a lot of people to fall through the cracks.

There's a few possibilities I can think of:

* Unpaid sick days

* The limitation is the other way around, they don't want to give a single pool of 30 paid days off, you're limited to 15 vacation days

* If you have a good relationship with your manager, it's a soft limit and they'll allow you to go over as long as it's not abused

* If you're part-time/hourly, trading days/hours with a co-worker

Our HR department combined vacation days and sick days into one pool several years ago when they realized most of us were faking sick days to get more vacation time.

From European perspective, yes the sick days absolutely can be limited - see Poland or Czechia. When you run out you better have acquaintances among doctors and at the appropriate public offices. Otherwise you're sick, fired, no income.

Well if I ran out of sick days I can use some vacation days and if that ran out I could get a doctors note and go off on medical leave. It is like unemployment in a sense and I would be eligible for I believe 55% my wage while off. If I just needed a few extra days and not really wanted to deal with the hassle of medical leave paperwork I am in good standing with my employer and would simply need to ask and could have some unpaid sick days for sure. So essentially the 15 days is just what you can take off and be paid my the company. Also not all companies offer these benefits I work in health care.

Sometimes, yes.