A program to educate the public about peripheral arterial disease, a circulatory condition that affects some 3 million Americans, has resulted in the screening of more than 50,000 people in the past four years, according to the National Council on the Aging.

The program, called Leg Alert, is supported by local hospitals and clinics.The condition is marked by an ache, pain or cramping in the legs, calves and lower torso, caused by narrowed or blocked arteries that limit blood flow to the legs.