In his announcement, Coulier revealed that he was undergoing chemotherapy and had made the decision to shave his head as a "preemptive strike," rather than wait for his hair to fall out. Coulier added that he wanted to share his personal battle with cancer to raise awareness about the disease, which has also affected his family.

Dave Coulier is staying positive as he battles a “very aggressive” form of cancer. The “Full House” star, 65, shared an update on his cancer treatment on Friday, posting a photo on his Instagram story giving a thumbs-up during a chemotherapy session.