What causes nosebleeds?

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  1. Dr. Kathleen Handal
     
    A nose bleed is often caused by a direct blow to the face or head, high blood pressure problems, or the use of blood thinning medications, including aspirin. It's hard to know how much bleeding occurs during a nose bleed because the victim often swallows some blood.
    More Related Answers from Dr. Kathleen Handal
    A nose bleed is often caused by a direct blow to the face or head, high blood pressure problems, or the use of blood thinning medications, including aspirin. It's hard to know how much bleeding occurs during a nose bleed because the victim... More
  2. National Athletic Trainers’ Association
     
    Nosebleeds may be due to a change in air moisture. When the air is dry, the nasal membranes dry out and are more susceptible to bleeding and infection. Nose picking may also lead to nosebleeds. (This answer provided for NATA by the Southern Connecticut State University Athletic Training Education Program)
    Nosebleeds may be due to a change in air moisture. When the air is dry, the nasal membranes dry out and are more susceptible to bleeding and infection. Nose picking may also lead to nosebleeds. (This answer provided for NATA by the Southern... More
  3. RealAge
     
    RealAge answered:

    Some common causes for a nosebleed include colds and allergies, injury to the nose, low humidity, high altitude, and vigorous blowing of the nose, or picking the nose. Since the blood vessels lie very close to the surface in the nose, even a slight injury can cause the nose to bleed.

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    More Related Answers from RealAge
    Some common causes for a nosebleed include colds and allergies, injury to the nose, low humidity, high altitude, and vigorous blowing of the nose, or picking the nose. Since the blood vessels lie very close to the surface in the nose, even a... More