The performer confirmed earlier this week (January 9) that he had been diagnosed with the early stages of lymphoma, which is a cancer that affects the blood vessels in the immune system.
In statement on his official website, Iommi explained: "I just want to say how overwhelmed I am with all your messages of support, thank you so much.
"Well it's not what I wanted for Christmas, that's for sure, but now I can't wait for the test results to come in and get going with the treatment."
He added: "It's really good that the guys are coming over so that we can continue working on the album as things are going great in the studio. Not much else to say at this time, so thanks again."
Black Sabbath are due to headline Download festival later this year as part of their European tour. It has not been confirmed whether the shows will have to be rescheduled.
Watch Black Sabbath announce their reunion back in November 2011 below: