An option that has always worked for me personally is this: I just ate very poorly and starved a lot. Due to this lack of food, my body reacted by regularly bleeding from my nose. When I got really sick of it, I began to eat better and no longer bleed. Then again, if I want, I can eat badly and the blood appears again.
Nasal bleeding usually occurs from a pressure surge. If you have pressure as an astronaut, it is very difficult to do this. And if the prerequisites are a strong overload, both physical and emotional. And pregnant women very often bleed from the nose) ) If weak vessels, and even coupled with pressure, bleeding without physical damage are provided to you.