Veins that look more visible or slightly raised under the skin are common and usually harmless. Their appearance can change from day to day based on temperature, activity level, hydration, and even how long you’ve been standing or sitting. Warm weather and exercise increase blood flow, causing veins to expand, while aging naturally thins the skin, making veins easier to see. Genetics, body weight, sun exposure, and tight clothing can also play a role. In most cases, these changes are simply the body responding to normal daily conditions.
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