Ozzy Osbourne’s sinusitis has caused two Black Sabbath dates to be postponed.

The postponements were announced on Twitter and Facebook with the statement “Due to extreme sinusitis with Ozzy the shows in Edmonton & Calgary have been postponed. Rescheduled dates will be announced soon.”

The Edmonton show was scheduled for Saturday (January 30) and Calgary for Monday (February 1).

Sinusitis is a sinus infection that causes a plugged nose and pain in the face but, in extreme cases as this appears to be, can also have fever, headaches, a sore throat and a cough.

Black Sabbath’s next scheduled date is Wednesday in Vancouver followed by Tacoma, WA on Saturday.