ear, nose, and throat disorders
Epistaxis
Pathophysiology of Epistaxis
Most nasal bleeding is anterior, originating from a plexus of vessels in the anteroinferior septum (Kiesselbach area). Less common but more serious are posterior nosebleeds, which originate in the posterior septum overlying the vomer bone or laterally on the inferior or middle turbinate. Posterior nosebleeds tend to occur in patients who have preexisting atherosclerotic vessels or bleeding disorders and have had nasal or sinus surgery. 