If you’re referring to the social-media phrase “If you have visible veins, it means you are…”, the missing ending is often something like “lean/low in body fat”—but visible veins do not necessarily mean that.
Prominent veins can also be influenced by:
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Genetics and naturally thin skin
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Exercise or increased muscle mass
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Heat or temporary increased blood flow
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Dehydration
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Aging
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Certain medical conditions or medications
If a vein suddenly becomes swollen, painful, red, warm, or hard, especially in one arm or leg, that’s different and should be medically assessed.
