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ROBIN ROBERTS (ABC NEWS) (Off-camera) And now to a "GMA" medical alert. I have some important information on how to know when leg pain is just a simple cramp, and when it's something serious, namely a blood clot, as many as 600,000 Americans get these clots, also known as deep vein thrombosis. And every year, at least 100,000 people die from them. So the surgeon general is kicking off a new campaign to tell people the warning signs. And our medical contributor, Dr. Marie Savard, joins us now with more. And I gave you the look, I did say that correctly. [ABSTRACT FROM PUBLISHER]

ELIZABETH VARGAS (ABC NEWS) (Off-camera) Shortly after his speech, the Vice President went to the hospital for tests after experiencing pain in his left leg. Doctors discovered he had a blood clot, a condition called deep vein thrombosis. It strikes millions of people every year, often after long airplane flights. And Dr. Tim Johnson joins us tonight. Dr. Tim, this condition can be quite serious. [ABSTRACT FROM PUBLISHER]