Healthy veins and diseased veins look distinctly different. Diseased veins are characterized by malfunctioning vein valves, which you can see allow blood to flow in the opposite direction than it should. Healthy veins, however, have strong vein valves that allow for proper blood flow. https://www.youtube.com/watch?v=z5huqFcql2c
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Healthy and Diseased Veins

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Healthy veins and diseased veins look distinctly different. Diseased veins are characterized by malfunctioning vein valves, which you can see allow blood to flow in the opposite direction than it should. Healthy veins, however, have strong vein valves that allow for proper blood flow.

https://www.youtube.com/watch?v=z5huqFcql2c

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