How are varicose veins and spider veins similar?

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Both varicose veins and spider veins are symptoms of chronic venous insufficiency.

Varicose veins and spider veins are both visible surface symptoms of chronic venous insufficiency, the inability of diseased leg veins to push blood back up towards the heart. The surface veins become distended and prominent because blood that should normally circulate through the body is instead accumulating in the legs.