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Nasal inflammation and thin layer of nostril caused by environmental (dryness and high attitude) or systematic condition (inflammation and Hypertension) are the main reasons of nose bleeding. Prolonged sun exposure make body temperature up and consequently skin vessels expanded but in healthy people nose bleeding should not take place except some kind of symptoms has already existed

Natural healthy nose create enough mucus / humidity, so if dryness due to excessive exercise and rapid breathing is the reason of nose bleeding then you can take a tiny amount of moisturizer inside your nostril to treat, otherwise some more parameters like if you have had Rhinoplasty, infection, allergy or any other systematic inflammation disorder such as psoriasis, IBD, croh'n syndrome should be considered. Also sun exposure make hypertension and related nose bleeding worsen.

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10y ago
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Q: Why do you bleed from the nose when exposed to the sun?
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