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What causes noses to bleed when blown?

Sometimes when I have a cold, especially in the winter, my nose starts bleeding if I blow it too often. Why does this happen? Am I doing something wrong?
Your nose is full of tiny little blood vessels called capillaries, which supply oxygen to your nose itself. These capillaries need to be close to the internal surface of your nose (its mucosa) in order for the tissue to stay alive. Because they are so tiny, capillaries are friable, meaning they can break under relatively minimal pressure, such as from repetitively blowing your nose. If you are on blood-thinning medication, such as Coumadin or Plavix, it is recommended that you do not blow your nose, because you are at risk of having a dangerous nosebleed that is difficult to stop while taking these medicines. This situation is made worse when it is cold and dry, making the mucosa of your nose even more susceptible to damage. This is quite similar to a kitchen sponge, which is much easier to break in half when it is dry. Your second question is largely a personal one, as each person's body is different. Using less force when you blow your nose will probably reduce the incidence of the nosebleeds, while ceasing to blow your nose will stop them altogether. Assuming that you do not have a bleeding condition and are not on any medicines that would make a nosebleed very dangerous, it is ultimately up to you to balance the risks of nosebleeds against the benefits of nose blowing.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under ZocDoc’s Terms of Service.

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