The Philadelphia Phillies placed Zack Wheeler on the 15-day IL on Saturday due to a blood clot in his right arm. Specifically, president of baseball operations Dave Dombrowski said Wheeler was diagnosed with a "right upper extremity blood clot," and few other details were offered. Wheeler had pitched Friday and was limited to five innings, later reporting what Phillies head athletic trainer Paul Buchheit referred to as "heaviness." Heaviness is a description patients will sometimes use when describing circulatory compromise which could occur as the result of a clot.

Blood clots in athletes may be due to a number of factors. They can occur as the result of direct trauma, resulting in bleeding or swelling that can contribute to clot formation. They can follow a period of immobilization

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