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the lower air pressure can cause the fragile blood vessels of the nose to burst because there is less air forcing them to stay together.

alternative answer: At higher altitude, the air gets thinner, and one consequence of that is reduced humidity. Sensitive mucous membranes dry out if there is too little humidity, and they become damaged and bleed. You may have seen how leather cracks if it gets too dry. This is a similar phenomenon.

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13y ago

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