Many: Disease such as hereditary hemorrhagic telangectasia is one that causes weak nasal blood vessels. Other systemic diseases such as high blood pressure or liver or kidney disease can either raise pressure or lower the chance for the blood to clot. Pregnant women also have nosebleeds, prevention is to keep the nose moist with saline or rhinaris. Pinch the bottom of your nose for 10 min-elevate head.
Answered 12/9/2013
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