5 Health Conditions That Can Cause Visible Veins

DVT is a serious condition where a bl00d clot forms in a deep vein, typically in the leg or thigh. Though the clot is not always visible, some cases may lead to prominent or bulging surface veins because of blocked blood flow.

Warning signs include:

Sudden swelling in one leg
Pain or tenderness, often starting in the calf
Skin that’s red or warm to the touch
DVT is potentially life-threatening because a clot can travel to the lungs (pulmonary embolism). Immediate medical attention is required.