I to use to have nose bleeds quite often. However I was told this was due to a lack in potasium and the fact that I had weak veins in my nose. These veins would burst with me so much as sneezing. While whizywhizy was correct in how to treat it, nowdays they say that it is bad for you to tilt your head back. This will cause the blood to drain down the nasal passage and into the throat causing other problems. Now you are told to pinch the nostrils and lean forward so that the blood ends up in the tissue.