Why are your veins suddenly bulging and visible?

Visible or bulging veins are often harmless, but in some cases they signal an underlying health issue. Common causes include exercise, hot weather, aging, genetics, tight clothing, excess weight, or long periods of sitting or standing. These factors can slow blood flow back to the heart, causing it to pool in weak or damaged veins and form varicose veins—swollen, twisted vessels usually in the legs but also in the arms.

Smoking, pregnancy-related hormone changes, and obesity further increase risk. Mild cases may be managed with lifestyle changes, compression stockings, or elevating the legs, while more severe cases may require medical procedures like injection therapy or vein surgery. Left untreated, varicose veins can cause complications such as venous ulcers or blood clots.

Although prevention isn’t always possible, maintaining a healthy weight, exercising regularly, quitting smoking, and avoiding tight clothing can reduce risk and help identify dangerous changes early.