I don't know about science, but this has happened to me multiple times in life at different ages. The common scenario with all of them is that there's a bucket

I don't know about science, but this has happened to me multiple times in life at different ages. The common scenario with all of them is that there's a bucket full of ice water & suckable mangoes (the one you don't cut, you just bite and make a hole, and then press the mango & let it ooze from that hole), its summer, and I am under a shade in open, in around afternoon or high sun, and I eat 10-12 of mangoes, I will feel the blood flowing through nostrils, and it will start dripping. If I eat 2-3, then no nose bleed. No nose bleed ever in life.