King Charles III Hospitalized Following Side Effects from Cancer Treatment

On March 27, 2025, King Charles III hospitalized briefly due to temporary side effects from his ongoing cancer treatment. According to Buckingham Palace, he underwent a scheduled medical procedure and required a short period of observation in the hospital. Afterward, he returned to Clarence House, his London residence. A palace source reassured the public that the side effects were minor and that the King’s recovery is progressing positively.

On March 28, 2025, King Charles made his first public appearance since the hospitalization. He was seen leaving Clarence House, waving and smiling at well-wishers as he departed in a black car. Despite his brief health setback, the King appeared to be in good spirits. His scheduled engagements for March 28 were canceled as a precautionary measure.

His Majesty King Charles III on his coronation day, May 6, 2023, Buckingham Palace balcony.

King Charles III Hospitalized: Does It Affect His Royal Engagements?

Despite his diagnosis, King Charles has continued to fulfill his royal duties behind the scenes, including weekly audiences with the British prime minister. His first public appearance after the diagnosis took place on March 31, 2024, when he visited a cancer treatment center in the UK alongside Queen Camilla, meeting with staff and patients undergoing chemotherapy. The King is expected to resume more public-facing duties in April 2025, including hosting the Emperor and Empress of Japan for a state visit in June. He is also preparing for his second Trooping the Colour as monarch in June.

How and When Was The King Diagnosed with Cancer?

King Charles III was diagnosed with cancer following a procedure for a benign enlarged prostate. On January 17, 2024, Buckingham Palace announced that the King would undergo treatment for an enlarged prostate, which was described as benign. He was admitted to a London hospital for the procedure on January 26, 2024, and was discharged on January 29, 2024. However, during the treatment for his benign condition, a separate issue of concern was identified. Subsequent diagnostic tests revealed the presence of cancer on February 5, 2024.

While specific details about the type of cancer or treatment regimen remain undisclosed, Buckingham Palace has maintained that King Charles remains optimistic about his recovery and committed to resuming full public duties as soon as possible.

Why the Palace Openly Informed About The King’s Cancer Battle, Breaking Longstanding Royal Tradition

Buckingham Palace openly disclosed King Charles III’s cancer diagnosis to break with the longstanding royal tradition of secrecy surrounding the monarch’s health. This decision reflects the King’s desire to foster transparency and prevent speculation about his condition. By sharing his diagnosis, Charles aims to encourage public understanding and support for individuals affected by cancer worldwide, particularly given his history as a patron of cancer-related charities during his time as Prince of Wales.

Additionally, the announcement was carefully composed to reassure the public that the King remains capable of fulfilling his role as head of state, even while undergoing treatment. Highlighting his continued engagement in state business emphasizes that his duties are not significantly impeded, alleviating concerns about the monarchy’s stability. This unprecedented openness marks a shift from Queen Elizabeth II’s approach, demonstrating Charles’ commitment to modernizing royal communication.

King Charles Collaboration with Health Organizations

In his 2024 Christmas message, King Charles expressed deep gratitude to health workers, particularly for their care during his and the Princess of Wales’ cancer treatments. He acknowledged their dedication and the vital role they play in supporting individuals and families during challenging times. In April 2023, King Charles became the patron of Cancer Research U.K., succeeding Queen Elizabeth II.

During a visit to the University College Hospital Macmillan Cancer Centre in London, he engaged with patients and shared his plans for ongoing treatment, highlighting his personal connection to the cause. Following Queen Elizabeth II’s passing, King Charles retained many of her health-related patronages, including organizations like Cancer Research U.K. and others focused on healthcare and community support.

The review of royal patronages ensured that key health-related charities continue to benefit from royal advocacy. These efforts underscore King Charles’ dedication to supporting health organizations and raising awareness about critical healthcare issues.

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How the Royal Family Supported King Charles During His Cancer Battle

Throughout King Charles’s battle with cancer, Queen Camilla has been a constant source of support. She accompanied him to public engagements, such as a visit to the University College Hospital Macmillan Cancer Centre in London, where they met patients and staff. Her presence highlights her role as a steadfast partner during this challenging time. King Charles also personally informed his sons about his diagnosis. Prince William has reportedly maintained close contact with his father throughout the treatment process. Additionally, Princess Chaterine revealed her own cancer diagnosis in March 2024 and has received unwavering support from King Charles, who expressed pride in her courage and maintained close communication with her during her treatment.

Support from World Leaders and Celebrities for King Charles III

Following King Charles III’s cancer diagnosis in February 2024, world leaders, politicians, and celebrities have expressed their support and well wishes for his recovery. U.S. President Joe Biden shared his concern and joined the people of the UK in praying for a swift recovery, highlighting the courage required to navigate a cancer diagnosis. Canadian Prime Minister Justin Trudeau expressed hope for a fast recovery and noted that Canadians and people worldwide were thinking of the King. New Zealand Prime Minister Christopher Luxon sent his best wishes, saying “Kia Kaha King Charles” on behalf of all Kiwis.

King Charles and  French President Emmanuel Macron, state dinner 2023.

French President Emmanuel Macron extended thoughts to the British people during this challenging time. UK Prime Minister Rishi Sunak stated he was in regular contact with the King and expressed confidence in his recovery, emphasizing that early detection was key. Former Prime Ministers Boris Johnson, Liz Truss, Tony Blair, and David Cameron all voiced their support for His Majesty. Scottish First Minister Humza Yousaf sent thoughts and prayers to the King and his family.

Public figures like Gary Lineker, Katie Piper, and Love Island star Dr. Alex George shared messages of encouragement on social media. Lineker called the diagnosis “awful news” and wished for a full recovery.

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Written by Aharon Tsaturyan MD