Visible veins often catch people by surprise. A faint blue or green line under the skin may suddenly appear darker, more raised, or easier to notice. In many cases, this is completely normal and linked to everyday changes inside the body rather than a serious health problem. Veins carry blood back to the heart and sit close to the surface of the skin, making them easier to see under certain conditions. Warm temperatures can cause veins to expand as the body cools itself, while exercise increases blood flow and temporarily makes veins stand out more. Body fat also plays a...
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