King Charles’ cancer is reportedly incurable, leading to speculation about his health, with the monarch likely to live “with” cancer rather than “of” it. Despite royal aides asserting he is responding well to treatment, the palace is concerned about rumors regarding his fragile condition, especially after Prince Harry’s comments on his father’s longevity. Changes to royal events, such as the Trooping the Colour, reflect his health status, while plans for his 80th birthday and a potential reunion with Harry at the 2027 Invictus Games signal ongoing royal activities.