Newly visible veins on hands, arms, legs, or chest are usually harmless, caused by aging, low body fat, exercise, heat, or hormonal changes. Thinner skin, increased blood flow, and muscle growth can make veins more noticeable, while factors like pregnancy or menopause can also affect their visibility. In rare cases, they may indicate underlying health issues that should be checked.
When to Worry About Veins That Appear Out of Nowhere
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