"He's endured a lot of difficult times, and he has been fighting hard," the band said in a statement. "In privacy along with his family, and through all of this, we've been standing by him."
The band went on to confirm that they will continue to perform as a group through Downie's illness.
"After 30-some years together as The Tragically Hip, thousands of shows and hundreds of tours ... we've decided to do another one," they announced. "This feels like the right thing to do now, for Gord, and for all of us."