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What causes varicose veins and spider veins?

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Weak valves in the veins, which prevent the backward flow of blood, may lead to them. Weaknesses in the vein walls may cause the pooling of the blood. Less commonly, varicose veins are caused by such diseases as phlebitis (inflammation of the veins) or birth defects of the veins.

From: Spider Veins and Varicose Veins WebMD Medical Reference

SOURCES: Harrison's Principles of Internal Medicine, McGraw-Hill, edited by Eugene Braunwald, et. al., 2001. A portion of this information was furnished by the Federal Trade Commission of the United States government.

Spider and Varicose Veins from MedicineNet.

Reviewed by Stephanie S. Gardner on February 12, 2019

SOURCES: Harrison's Principles of Internal Medicine, McGraw-Hill, edited by Eugene Braunwald, et. al., 2001. A portion of this information was furnished by the Federal Trade Commission of the United States government.

Spider and Varicose Veins from MedicineNet.

Reviewed by Stephanie S. Gardner on February 12, 2019

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Do spider veins and varicose veins always need treatment?

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