King Charles shared a moment of understanding with Raymond Burgess today, a patient currently undergoing chemotherapy.
Mr Burgess explained to the monarch that his treatment leaves him with an unpleasant taste in his mouth.
Drawing on his own experience with an undisclosed form of cancer treatment, King Charles responded with evident empathy: "It's an awful sort of metallic taste."
He added: "It doesn't exactly help with eating."
King Charles made a candid confession about his cancer treatment side effects in a health update
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The exchange highlighted the King's personal familiarity with the challenges faced by those receiving cancer treatment, having himself been undergoing an undisclosed form of therapy since his diagnosis was made public in February 2024.
Buckingham Palace announced in December 2025 that the monarch had responded exceptionally well to his cancer treatment following the diagnosis made public in February 2024.
This positive progress prompted his medical team to transition his care into what has been described as a "precautionary phase" at the beginning of this year, substantially reducing how often he attends treatment sessions.
King Charles made the comments during a visit to Guy's Hospital cancer centre today.
King Charles met chemotherapy patients David Coleman, Raymond and his wife, Sue, and Caroline during a visit to Guy's Cancer Centre
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The institution is celebrating three centuries of service.
The monarch spent time with patients receiving chemotherapy, as well as medical staff, including doctors and nurses, at the south London facility.
During his visit, the King was given a tour of the state-of-the-art Innovation Hub, which showcases the hospital's cutting-edge approach to cancer care.
The engagement concluded with the unveiling of a commemorative plaque to mark the 300th anniversary of Guy's Hospital, one of the capital's most historic medical institutions.
King Charles met staff and members of the public during a visit to Guy's Cancer Centre
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The King first revealed his cancer diagnosis in February 2024, though the Palace has not disclosed the specific type, confirming only that it was not prostate cancer.
The condition was discovered during treatment for a benign prostate enlargement.