Zach Wheeler is the ace of the Philadelphia Phillies pitching staff. The Phillies are in first place in the National League East, due in no small part to Wheeler’s pitching. In a huge shock to the Phillies and their fans, Wheeler suffered a blood clot in his pitching arm, and likely has developed venous thoracic outlet syndrome.

Baseball players, particularly pitchers, suffer from thoracic outlet syndrome at higher rates than ever before. Learn why these elite athletes are at increased risk for TOS.

These five symptoms should make you think of thoracic outlet syndrome.

A 50 year-old woman fell down a flight of stairs at work. Pain, numbness and tingling developed rapidly in her left arm, and then in her right arm.