I was puzzled about what complications can occur so I looked it up. I knew about one of them but here's a page that gives a full list.
I confess that I am shocked by the recent group of famous people dying in their fifties. I mean, it's possible to die at any age and people die much younger. Maybe it's just that I am about to turn 50 myself, both my parents died in their early fifties, and so I'm sensitized to that age group and death. I don't know. But it seems like we are losing some really good people way too soon.