Costello said he and his band, The Imposters, plan to release a new record in October.
Costello did not go into detail about the nature of his cancer, but shared a message about the importance of health screenings.
“Take very good care of your loved ones but Gentleman, do talk to you friends — you’ll find you are not alone — seek your doctor’s advice if you are in doubt or when it is timely and act as swiftly as you may in these matters,” he added. “It may save your life. Believe me, it is better than playing roulette.”