Wow, this is frightening news to hear! According to Ken Rosenthal of The Athletic, the Yankees veteran underwent a heart procedure on December 11 after experiencing symptoms of acid reflux and heartburn.
The symptoms started occurring before CC was scheduled to leave for England to promote the Yankees and Red Sox two-game series in London next June. He noticed that he was sweating more than usual while he was exercising on a bike and than started experiencing chest pain so he went to get it checked out. It turns out he had a blockage in one of the arteries leading to his heart which required a procedure to insert a stent to the open artery.