Epistaxis Basics : Anatomy, Physiology and Pathology

Synonyms: Nosebleed, Nasal bleeding

Definition: Epistaxis is defined as bleeding from the nasal cavity. It ranges from minor blood-tinged mucus when blowing the nose to life-threatening hemorrhage.


  1. Age: Bimodal distribution – common in <10 years and >60 years
  2. Season: Winter

Anatomy and Physiology:

Why is the nose prone to bleeding?

Nose is a highly vascular organ with a large surface area secondary to intense heating and humidification requirements which also predispose it to bleeding. The peculiar features of the vascular supply of nasal cavity are:

  1. Vasculature runs just under mucosa, which is not a squamous epithelial tissue
  2. Several arterial and venous anastomoses
  3. Receives blood from the territories of the external and internal carotid arteries

Arterial supply of the nasal septum:

Little's area

The region above the root of the middle turbinate is supplied by the anterior and posterior ethmoidal arteries, these are branches of the ophthalmic artery (internal carotid), with the remaining areas being supplied by the sphenopalatine, greater palatine and superior labial branch of facial artery (external carotid). The sphenopalatine artery is considered to be the main arterial supply of the nasal cavity and originates from the maxillary artery. The posterior ethmoidal artery may be absent in 30% of noses.


Internal carotid system (Above the root of middle turbinate):

  1. Anterior ethmoidal artery (from ophthalmic artery)
  2. Posterior ethmoidal artery (from ophthalmic artery)

External carotid system (Below the root of middle turbinate):

  1. Septal branch of sphenopalatine artery (terminal branch of maxillary artery)
  2. Greater palatine artery (from maxillary artery)
  3. Septal branch of superior labial artery (from facial artery)

Venous supply of the nasal septum:

The veins generally follow the arteries, but additional emissary veins connect the venous drainage to the cavernous plexus. A relatively common finding is a prominent retrocolumellar vein that runs parallel to the columella adjacent to the mucocutaneous junction.

Sites of Bleeding:

Site of BleedingLittle’s area or Kiesselbach’s plexusWoodruff’s plexusRetrocollumelar vein
Incidence90%; Children and young adults10%; Elderly and hypretensivesYoung people (<35 years)
Results inAnterior epistaxisPosterior epistaxisVenous epistaxis
LocationAntero-inferior region of nasal septum, just above the vestibuleIn the lateral nasal wall, inferior to the posterior end of inferior turbinate2mm behind the columella at the anterior edge of  the little’s area
AnastomosisAnterior ethmoidal artery + Superior labial artery + Sphenopalatine artery + Greater palatine artery (All that supplies nasal septum except posterior ethmoidal artery)Posterior nasal artery + Sphenopalatine artery + Ascending pharyngeal arteries (All are branches of internal maxillary artery belonging to ECA system) 
FeaturesNasal mucosa is very fragile and is tightly adherent to the underlying cartilage and thus offers little resistance to mechanical or functional stress – so easily irritated by nasal picking, cold dry air, cigarette smokingThe plexus is venous in origin and have no muscle walls leading to poor hemostasis.Crosses the nasal floor and anastomose with the plexus of lateral nasal wall.


Also, the commonest site of nose picking.

Note: Another common site of bleeding is Browne’s area which is situated on the posterior part of the nasal septum.

Classification and Causes of Epistaxis:

A. Primary or Secondary Epistaxis:

1. Primary (Idiopathic): 70-80%

2. Secondary (Proven casual factor):

Local (Nose)General

  1. Nose picking
  2. Facial trauma
  3. Foreign body

  1. Hypertension
  2. Mitral stenosis
Nasal or sinus infections:

  1. Vestibulitis
  2. Sinusitis
  3. Atrophic rhinitis
  4. Rhinosporidiosis
Blood and blood vessels:

  1. Hereditary hemorrhagic telengiectasia (Osler-Weber-Rendu syndrome)
  2. Aplastic anemia
  3. Thrombocytopenia
  4. Vitamin K deficiency
Nasal or sinus neoplasms:

  1. Angiofibroma
  2. Hemangioma
  3. Inverted papilloma
  4. Malignancies
Liver disease: Liver cirrhosis
Deviated nasal septumRenal disease: Chronic Kidney Disease

  1. Septal, nasal, sinus or orbital surgeries
  2. Nasogastric tube instertion
  3. Nasotracheal tube insertion

  1. Salicylates
  2. Anticoagulants

  1. Dry cold conditions (Winter)
  2. Prolonged inhalation of dry air (Oxygen)
  3. Atmospheric changes at high altitudes
Mediastinal tumors: Increases venous pressure in nose

  1. Topical corticosteroids and antihistaminics
  2. Solvent inhalation
  3. Snorting cocaine
Acute general infection:

  1. Influenza
  2. Measles
  3. Whooping cough
 Vicarious menstruation

B. Adult or Childhood Epistaxis:

  1. Childhood epistaxis: <16 years
  2. Adult epistaxis: >16 years

C. Anterior or Posterior Epistaxis:

Anterior and posterior epistaxis

 Anterior EpistaxisPosterior Epistaxis
IncidenceMore common (90%)Less common (10%)
SourceAnterior to the plane of piriform aperturePosterior to the plane of piriform aperture
Blood flowsOut from the front of noseBack into the throat
AgeChildren or young adults>40 years
Common siteLittle’s areaWoodruff’s plexus
Common causeTraumaSpontaneous – Hypertension or arteriosclerosis
SeverityLess severeSevere
TreatmentUsually controlled by local pressure or anterior packRequires hospitalization and posterior nasal pack is often required

Common causes by age:

  1. Children: Nose picking, Foreign body, Exanthematous fever, Nasal diphtheria
  2. Adolescent: Nasopharyngeal angiofibroma, Traima, Sinusitis
  3. Adults: Sinusitis, Trauma, Idiopathic
  4. Middle age: Tumors
  5. Elderly: Hypertension, Malignancy

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