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But if you get nosebleeds a lot -- there may be a reason you can pinpoint: 1  Dry climates or dry, heated air that dries out the inside of your nose. 2  Picking your nose or rubbing it too hard. 3  A cold.  Repeated nose- 1 blowing. An injury to your nose.  Allergies or allergy medicines that can dry out your 1  nose. Other medications youâre taking.
Topics | Ear, Nose and Throat | Nose Disorders | Why does blowing your nose cause nose bleeding? The inside of the nose is lined with tiny little blood vessels. When a person has a cold or allergies causing a runny nose the inside of the nose gets red and irritated (inflamed). This swelling inside the nose and irritation causes the thin lining of the nose that covers these tiny blood vessels to thin even more making the tiny blood vessels closer to the surface.