Instagram/Dave Coulier Celebrity Dave Coulier opens up about drastic weight loss and voice changes after extensive radiation therapy for throat cancer. May 8, 2026 AceShowbiz - Dave Coulier shared a health update on Instagram, addressing the noticeable changes in his appearance and voice following treatment for cancer. The actor and comedian confirmed that fans' observations were accurate, attributing the differences to "extensive radiation" therapy he underwent for carcinoma in his throat.