21 year old, normal/athletic build (80kg and 1,87m), having random nosebleeds (no medical history).. it comes and goes for a week i'd have nosebleeds during the day and whilst sleeping(also without me noticing untill i see my pillow all red) and then it'll stop for some great period of time and acts up again. I've been having this problem since i was a child and no answers yet.