Stopping a Nosebleed – Topic Overview Most nosebleeds occur in the front of the nose and involve only one nostril. Some blood may drain down the back of the nose into the throat. These nosebleeds typically are not serious, and you can generally treat them yourself at home.
A less common but more serious type of nosebleed starts in the back of the nose and often involves both nostrils. Large amounts of blood may run down the back of the throat. This type of nosebleed may occur more frequently in older adults because of health conditions they may have. You will need treatment from a doctor to control bleeding from this type of nosebleed. http://www.webmd.com/first-aid/tc/stopping-a-nosebleed-topic-overview