Cancer diagnosed in King Charles.

Buckingham Palace announced Monday that King Charles III, 75, has been diagnosed with cancer and will be avoiding public events to minimize in-person contacts.

Royal experts reveal that the announcement of the monarch's ailments marks a significant departure from the past, when such information was typically kept hidden from the public.

The palace announced that during the King's recent hospital procedure for benign prostate enlargement, a separate issue of concern was noted. Subsequent diagnostic tests have identified a form of cancer.

The statement also did not specify what stage the cancer was found.

Separately, Buckingham Palace said Charles did not have prostate cancer.

A week after Kate and King Charles were discharged from a private London clinic following medical procedures, the king underwent a "corrective procedure" for an enlarged prostate, while Kate, 42, had unspecified abdominal surgery on Jan. 17.

The statement added that His Majesty has started a routine of treatments and has been advised by doctors to delay public duties during those times.

The king aimed to reveal his diagnosis in part to prevent speculation about his health but also to aid global understanding of cancer for those affected by it.

As patron to cancer-related charities, Charles often spoke publicly in support of cancer patients, their loved ones, and the health professionals who care for them, according to Buckingham Palace.

The king began out-patient care in London on Monday, but no further details about his treatment or prognosis were shared by a palace spokesperson.

Sarah Gristwood, a royal biographer and historian, remarked that it was "remarkable" that the diagnosis was made public, given the royal family's history of concealing any signs of human fallibility.

According to Gristwood, King George's severe condition was concealed not only from the public but also from himself during his illness, which eventually led to his death in 1952. However, Gristwood noted that such attitudes are no longer prevalent today.

Elizabeth II, Britain's longest-reigning monarch, passed away at the age of 96 in September 2022, months after her son, Charles, ascended the throne in a coronation ceremony held in May.

Although Kate is still recovering, William, the Prince of Wales, will attend the London's Air Ambulance Charity Gala Dinner on Wednesday.

The Princess of Wales is unlikely to resume her royal duties before Easter, which falls on March 31. No specific date has been announced for the king's return to duties.

The palace announced that many of the king's planned engagements will be postponed or canceled, apologizing in advance to anyone inconvenienced. Queen Camilla will continue with her full public duties as Charles undergoes treatment.

Craig Prescott, a law professor at Royal Holloway, University of London, stated that Buckingham Palace has confirmed that no counsellors of state will be appointed, indicating that the king will continue to fulfill his duties.

Prescott stated that if the king is unable to perform his duties due to illness or travel, counsellors of state can be appointed to perform the formal, constitutional functions of the monarch, such as granting the royal assent to legislation and reviewing the king's red boxes.

An insider close to the Duke and Duchess of Sussex revealed to NBC News that Prince Harry discussed his father's diagnosis with him.

In the upcoming days, His Majesty will be visited by him in the U.K., according to the source.

In 2020, Harry left his position as a senior member of the royal family and now resides in California with his family. Although he has occasionally returned to Britain, he has expressed concerns about the security of his family and the growing tension between him and his father and brother William.

He attended both his grandmother's funeral and his father's coronation.