The reality TV star's Web site reports that Michaels had what doctors call a "warning stroke" and had a patent foramen ovale, or hole in the heart, diagnosed. Michaels's publicist, Joann Mignano, confirmed the report.
The condition is treatable but likely unrelated to the brain hemorrhage he suffered last month.
The Web site says Michaels is "up, walking, talking, continuing his daily rehab and very happy to be alive," and he hopes to make a full recovery.
The Poison frontman was expected to appear at Sunday's finale of "Celebrity Apprentice" in New York.
