What causes spider veins?

Spider veins are small, thin, bluish-purple or red veins on the skin very near the surface of the legs. Compared with other veins in the body, leg veins have the toughest job of carrying blood back to the heart, sometimes resulting in the backup of blood in the leg, called venous reflux. Spider veins appear in the legs due to the pressure of body weight, gravity, and the task of carrying blood from the bottom of the body up to the heart. They can also appear on the foot and the face.

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