How do you prevent a nosebleed before it happens?

Dry air, nose pickin: The two most common causes of nosebleeds are: dry air — when your nasal membranes dry out, they're more susceptible to bleeding and infections nose picking, if you could prevent those you could stop 80% the nose bleed.

Water and humidifier: Keep your mucous membranes moist by drinking a lot of water and add moisture indoors by running a humidifier constantly.