It’s common to notice visible veins on your hands, arms, or legs — especially if you’re lean, athletic, or aging. In many cases, these prominent veins are harmless, the result of low body fat, exercise, or genetics.
But sometimes, suddenly visible, bulging, or discolored veins can be more than just a cosmetic quirk. They can be early warning signs of underlying health issues — some of which are serious.
Here are 5 medical conditions that can cause noticeable veins — and what you should do about them.
1. Chronic Venous Insufficiency (CVI)
What it is:
A condition where the valves in your leg veins weaken or fail, making it harder for blood to flow back to the heart. As a result, blood pools in the legs, causing veins to stretch, bulge, and become visible.
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