It can depend. If you’re getting nosebleeds in the winter time, it’s likely that your mucous membranes are dry, and when they get dry, they can crack and bleed.
It might be from some trauma. I.e. you’ve been rubbing it and abrating it for some time (blowing your nose) and the tiny blood vessels there popped.
There are several others, but I’d think those are the major ones for when it would be random.
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