First Aid for nose bleeds....

Epistaxis- nose bleed- is a very common occurrence, and can happen due to injury, or it can just start suddenly for no apparent reason.  Common causes could include prolonged dry air, fragile surface blood vessels in the nose, or high blood pressure. 

Initial treatment for nose bleed is to keep the individual in an upright position, which leads to relatively decreased blood pressure in the nasal vessels (compared to lying down.) Leaning forward is very important, as this helps to prevent swallowing...  Read more here: http://www.carpentercprsolutions.com/-blog/first-aid-for-nose-bleeds