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Nose bleeds happen when the blood vessels in the upper part of the nose break and bleed. This is usually caused by injury, colds, or allergies. It is not a serious problem, and can be treated by holding the nose closed with the fingers for 10 minutes. Occasionally, however, it might be a sign of severe calcium deficiency or drug abuse. Have any questions about nose bleeds? Join our online group to meet people who can answer them.