Aamir, age 38, is an active, fit man who frequently travels the world for his work. One day he woke up in excruciating pain. Though Aamir insisted it was nothing more than stress, his doctors insisted on further testing. They discovered Aamir had a pulmonary embolism brought on by deep-vein thrombosis.

This clip was excerpted from the documentary film "Blood Detectives."

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