Take slow deep breaths through your mouth.
Keep your head DOWN. Tilting your head back can cause the blood to run down the back of the throat and poses a choking hazard. Any first-aid manual will tell you do NOT tip your head back.
Put ice on the bridge of your nose (the bony part). Placing ice on the back of you neck works well as there is an artery located there that sends blood to your head.
Pinch your nose just below the bridge. There is a vein just below the nose bone that is the source of many bloody noses. Pinching puts pressure on it, which arrests the bleeding and speeds the clotting process.
Pinch for 10 minutes. Try not to let go to see if the bleeding has stopped - it might start again.
If the bleeding continues, pinch again for another 10 minutes. If your nose is still bleeding, pinch for a further 10 minutes. If the bleeding still persists, then seek medical attention.
at 3:34 PM on Oct. 22, 2008