Where do most nosebleeds come from?

Most nosebleeds are anterior, arising from Kiesselbach's plexus on the front part of the nasal septum, where superficial blood vessels are exposed to drying and minor trauma.

What is the difference between anterior and posterior nosebleeds?

Anterior nosebleeds come from the front of the nasal septum, are the most common, and are usually easy to control; posterior nosebleeds arise deeper in the nose, are less common, and tend to be more severe and harder to manage.

Epistaxis and Nasal Bleeding Disorders

Epistaxis, or nosebleed, is bleeding from the nasal cavity. It is among the most common otolaryngological emergencies and ranges from trivial, self-limited anterior bleeds to severe posterior haemorrhage. Most nosebleeds arise from the anterior septum, where a dense, superficial network of vessels (Kiesselbach's plexus) is exposed to drying, trauma, and irritation.

Definition

Epistaxis is acute haemorrhage from the nostril, nasal cavity, or nasopharynx; it is classified anatomically as anterior (typically from Kiesselbach's plexus) or posterior (from deeper branches, often the sphenopalatine artery), the latter being less common but potentially more severe.

Scope

The entry covers the vascular anatomy underlying nosebleeds, the distinction between anterior and posterior epistaxis, common local and systemic contributors, and the framework set out in current clinical practice guidance. It is reference-educational and does not provide individualised diagnostic or treatment instructions.

Core questions

Where in the nose do most nosebleeds originate and why?
How do anterior and posterior epistaxis differ in source and severity?
What local and systemic factors contribute to nasal bleeding?
How does current guidance frame the assessment of epistaxis?

Key concepts

Anterior epistaxis
Posterior epistaxis
Kiesselbach's plexus (Little's area)
Sphenopalatine artery
Local contributors (trauma, dryness, digital trauma)
Systemic contributors (anticoagulation, coagulopathy, hypertension)
Hereditary haemorrhagic telangiectasia
Recurrent epistaxis

Mechanisms

The nasal mucosa is richly vascularised by branches of both the internal and external carotid systems, and these vessels lie close to the surface, making them prone to bleeding. Most nosebleeds are anterior, arising from Kiesselbach's plexus on the anterior nasal septum, an area exposed to drying air, digital trauma, and irritation. Posterior bleeds, often from the sphenopalatine artery, are less frequent but harder to control and more likely to be clinically significant. Local factors such as trauma and mucosal dryness, and systemic factors such as anticoagulant use, bleeding disorders, and vascular conditions like hereditary haemorrhagic telangiectasia, raise the likelihood and severity of bleeding.

Clinical relevance

Epistaxis is a very common presentation across primary care, emergency, and otolaryngology settings, mostly minor but occasionally life-threatening. Understanding the anterior-posterior distinction and the local and systemic contributors clarifies how the symptom is approached; this entry describes the condition and is not a basis for individual diagnosis or treatment.

Epidemiology

Nosebleeds are experienced by a majority of people at some point in life, with a bimodal age distribution that peaks in childhood and again in older adults. Only a minority seek medical care, but epistaxis is nonetheless a leading otolaryngological reason for emergency presentation, and risk rises with anticoagulant and antiplatelet use.

Evidence & guidelines

The AAO-HNS Clinical Practice Guideline on Nosebleed (Epistaxis) provides the contemporary evidence-graded framework for assessment and the structured approach to anterior and posterior bleeding; it is the principal reference document for this topic.

History

Nosebleed has been described and treated since antiquity with packing and cautery, and the relevant vascular anatomy was clarified in the nineteenth and twentieth centuries, with Kiesselbach's and Little's descriptions of the anterior septal vascular area. Management has since been organised by the anterior-posterior distinction and, more recently, codified in evidence-based clinical practice guidance.

Key figures

David Tunkel
Spencer Payne
Richard Rosenfeld

Seminal works

tunkel-2020-nosebleed

Frequently asked questions

Where do most nosebleeds come from?: Most nosebleeds are anterior, arising from Kiesselbach's plexus on the front part of the nasal septum, where superficial blood vessels are exposed to drying and minor trauma.
What is the difference between anterior and posterior nosebleeds?: Anterior nosebleeds come from the front of the nasal septum, are the most common, and are usually easy to control; posterior nosebleeds arise deeper in the nose, are less common, and tend to be more severe and harder to manage.