Since covid can cause many of the things you might end up in the hospital with, there is no easy way to disentangle them, heart attack, covid can cause that, blood clots, yep covid can cause that, stroke, possibly, lung problems obviously. The only clearly not caused by covid is things like pregnancy (I suppose covid could cause complications but it doesn't cause pregnancy), a schedule surgery like knee surgery etc.. Even a broken bone could I supposed be caused by one of the long covid type symptoms like brain fog or fatigue making one clumsy although clearly one can get a broken bone without covid. And one doesn't die of many of these things either.