A nosebleed is characterized by bleeding from the interior of the nasal cavity. It can be caused by heat, dry air, trauma to the nose, certain medications, or a medical condition.


Anterior nosebleeds, or bleeding of the nose that comes from near the nose opening, are the most common nosebleeds in children. Children are twice as likely to experience nosebleeds as adults are. Bleeding that originates from deep within the nasal cavity is known as a posterior nosebleed, the type usually experienced by adults.

Causes and symptoms

The most common causes of nosebleeds are:
  • Low humidity. Hot and dry climates can dry out the nasal cavities.
  • Nasal trauma. Injuries to the nose can cause bleeding. Excessive nose picking can also injure the interior of the nose.
  • Cold, allergies, and sinus infections. Excessive nose blowing and irritation to the mucous membrane can cause bleeding.
  • Medications. Bleeding can be triggered by Certain medications, particularly those with anticoagulant (or blood thinning) properties.