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What is the most common cause of leg pain in the elderly?

According to the USA Vascular Centers, up to 20% of people over the age of 70 may have peripheral artery disease (PAD). PAD is the most common cause of leg pain in the elderly, caused by atherosclerosis, or plaque buildup, in the arteries that supply blood to the legs. This plaque buildup restricts blood flow and can lead to a variety of painful symptoms, especially during physical activity.