Visible veins under the skin are a common and usually normal part of the human body. Many people notice them more during warm weather, after exercise, or when standing for long periods. Heat and activity increase blood flow, causing veins to expand slightly and become more noticeable. As we age, the skin thins and loses elasticity, making veins easier to see. Genetics, body fat, hydration, and body position also influence vein visibility. In most cases, these changes are simply natural responses and not a sign of serious health issues.
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