I used to suffer from something that could be called "chronical" nosebleed. It's not a disease though, I just bled alot. Twice a day was not uncommon and it bled alot. Sometimes it took an half hour before it stopped.

Went to the doctor, he put some kind of acid on a stick and put it up my nose. Burn all my veins in the nose, hurt like shit for 3 days. Today, I rarely have nosebleed.