Our veins present a smart system of one-way valves that perform an important function of delivering oxygen-poor blood from the body back to the heart. Normally, we don’t think about our veins that much until we see them popping up under the skin. If your veins became visible and you can’t figure out why this has happened, don’t worry. Prominent veins may sometimes tell us about certain health problems, but in many cases, they have natural causes that are not dangerous for your health.
from BrightSide RSS https://brightside.me/inspiration-health/why-do-some-peoples-veins-appear-through-their-skin-629210/
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