Hulk Hogan had a big medical scare this week -- after doctors thought they may have found an abnormality with the wrestler's heart.
Hogan was undergoing tests for back surgery, when doctors discovered a problem with his EKG.
Sources close to Hulk tell us the back doc sent Hulk to a specialist at a cardiovascular medical center in Florida for further testing.
But this story has a happy ending -- we're told doctors ran more extensive tests and were able to determine that Hulk's ticker is working just fine ... though we're told Hulk was "very worried" during the process.
And with his heart all hunky-dory, Hulk is scheduled to undergo back surgery soon.