Black Sabbath issued a statement on Monday telling fans the guitarist is keeping a positive attitude and is "determined to make a full recovery."
The message, posted on the band's Facebook.com page, reads, "With the news that Black Sabbath's Tony Iommi has been diagnosed with the early stages of lymphoma, his bandmates would like everyone to send positive vibes to the guitarist at this time."
"Iommi is currently working with his doctors to establish the best treatment plan - the IRON MAN of Rock & Roll remains upbeat and determined to make a full and successful recovery."
The news comes just two months after Black Sabbath announced plans for a reunion. Iommi's bandmates Ozzy Osbourne, Bill Ward and Geezer Butler will now record their new album in the U.K. instead of Los Angeles while Iommi receives treatment for his illness.
And Iommi's rock star friends are already rallying around - guitarist Slash took to Twitter.com shortly after the announcement to write, "Best wishes (sic) for a full recovery to Tony Iommi."