Details of the type of cancer have not been disclosed and aides would not say how long the course of treatment would last.
However, Kensington Palace said it is confident that Kate will make a full recovery.
In her heartfelt video statement, the future Queen revealed that she would have to take a break from royal duties to focus on her recovery. She also asked that the family "need some time, space and privacy" while she undergoes treatment.
Aides gave no indication of when Kate's return to royal duties could be but it is understood that there are no plans for the Prince and Princess of Wales and their family to attend the Easter Sunday church service next week.
It had been hoped that Kate would attend the annual Windsor service.
Last year the couple's youngest child Prince Louis made his debut at the private family event, alongside his siblings Prince George and Princess Charlotte.
However, the Wales family are focused firmly on safeguarding their children, with William set to take a break from royal duties over the holiday.
His children, who attend Lambrook School in Windsor, will have just under four weeks off, returning on Wednesday April 17.
Denne historien er fra March 23, 2024-utgaven av Daily Express.
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Denne historien er fra March 23, 2024-utgaven av Daily Express.
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Slo torture as Brits waste a golden chance to end hoodoo
BOULTER RUNS OUT OF GAS AND TEAM LOSE THEIR WAY
BY EDDIE DID ME A FAVOUR HAVING A GO
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HILL DOESN'T TOP BILL
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From clifftop ceremonies to campervan-driven vigils and funeral pyres, Rupert Callender s revolutionising the 'bad theatre' that characterises the business of death in modern Britain
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Residents have sleep shattered by bird's noisy 3am squawking
Mission to revive boxer pupfish after zoo finds it has the only one left
A ZOO is spearheading a conservation effort to save a rare fish species from extinction - after discovering it had the last remaining boxer pupfish.
'I'll never forget the horror in my dying husband's eyes'
A WIDOW who watched her husband choke to death due to cancer says she will never forget the look of horror in his eyes.
Gisele blasts the 'cowards' accused.of her many rapes
A FRENCHWOMAN who was sexually violated by scores of men after her husband drugged her called them all \"cowards\" yesterday as she gave evidence for the last time.
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THE SINGLE most appalling aspect of the Allison Pearson story is that she was not told of what exactly she was accused.
