The Princess of Wales said cancer was detected after her surgery earlier this year.
Kate Middleton shared hercancer diagnosisin an unexpected video statement last night.
The Princess of Wales explained that the news came as a huge shock to her and her family.
Heres a look at what is publicly known about her condition at the moment.
When and how did Kate find out she had cancer?
News of the surgery was announced the day after it happened.
The Palace only said it was successful, but did not offer any further details.
What is cancer and how common is it?
TheNHSsays: Cancer is a condition where cells in a specific part of the body grow and reproduce uncontrollably.
The cancerous cells can invade and destroy surrounding healthy tissue, including organs.
Cancer can sometimes spread through the body, too thats known as secondary or metastatic cancer.
One in every two people in the UK will develop cancer in their lifetime.
There are more than 200 different types, and each one is diagnosed and treated differently.
Survival rates from cancer have doubled over the last 50 years, according to Cancer Research UK.
Theres a huge variation in survival between cancer types.
Fifty per cent survive cancer for 10 or more years, according to Cancer Researchs data from 2010-11.
What kind of cancer has Kate been diagnosed with?
Kate did not reveal this, and neither did the Palace.
A Kensington Palace spokesperson said: We will not be sharing any further private medical information.
The princess has a right to medical privacy as we all do.
What treatment is the Princess of Wales receiving?
Kate said in her statement her team advised her to start preventative chemotherapy in late February.
She is now in the early stages of this treatment.
Chemotherapy is an un umbrella term for medication administered by drip or via pill meant to kill cancerous cells.
When will Kate return to the public eye?
But, the royal officials seem confident Kate will recover.
The statement said: The Princess is now on a recovery pathway.
