Exercise and heat can also make veins stand out temporarily because blood flow increases and blood vessels widen. Physically active people and those with more muscle or less body fat may notice them more often.
Visible veins alone do not prove that someone has either excellent circulation or heart disease. Doctors look at symptoms, examinations, and tests rather than judging cardiovascular health by vein appearance alone.
Medical attention may be useful if veins suddenly change or are accompanied by pain, swelling, redness, burning, skin discoloration, or heaviness in the legs. In most cases, though, prominent veins are simply a normal feature of the body.
