How do nosebleeds develop? (without cuts or blunt force)
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The blood vessels in your nose are the thinnest blood vessels that are exposed to the environment. Your tissues dry out and become less flexible when it’s dry out, and this can cause them to crack.
Also, if you have high blood pressure (particularly because of hypervolemia, or too much blood in not enough pipes), these blood vessels become the weakest link and can rupture on a particularly strong heart beat. When they do, you lose some blood, your blood pressure lowers a little to safer levels. In this way, they kind of function like little relief valves.
I doubt this is really any kind of evolutionary design, but it is known that some people with high blood pressure suffer from frequent nosebleeds, and any bleeding would alleviate some of that pressure. This is good because other more serious effects such as strokes could occur from high blood pressure if your nose didn’t relieve the pressure first.
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