Visible blue veins on the hands are usually harmless and common in people with pale or thin skin, older adults, athletes, or during pregnancy, but they can sometimes indicate varicose veins or more serious issues like blood clots. If veins become swollen, painful, red, or warm, seek medical attention promptly, as these could signal conditions such as deep vein thrombosis. Staying active, maintaining a healthy weight, avoiding prolonged sitting or standing, and quitting smoking can help keep veins healthy. While often just cosmetic, sudden changes or discomfort should always be checked by a doctor.
