Be it a tumor whose malignancy has yet to be determined, or a moderately risky surgery or suspection of a stroke not taken seriously enough. If anyone I know and somewhat like goes through something like that I freak out completely. Sometimes it's also just something small that may be a symptom of something bigger.

It's even worse than when I fear for my own health, which I do a lot (my heart does some funny things). But if it's someone else I stop to function completely I can't think of anything and read up all there is to it and potential complications leading to death or disability. I get very anxious myself and try not to talk too much to them while trying to be supportive as I don't want to make them even more anxious, but if I realize people don't take it seriously it pushes me off the edge.

What if it really is something fucking dangerous and they die and I was suspecting it may be that but they have been brushing it off waiting for an appointment or I did not tell them since I am an anxious fuck and didn't want to make them worse.

Thanks to not caring so much about myself I can somewhat live with the uncertainty of my heart potentially killing me at any random time, but I can't deal with it if it's someone I care about.