What we know about Kate's cancer diagnosis

Catherine, Princess of Wales, says she is having treatment for cancer which was discovered following major abdominal surgery. She started preventative chemotherapy in late February.

The princess underwent surgery in January. The palace did not disclose details at the time but said the procedure was planned and her condition was "not cancer-related".

Her video message says that tests carried out after the operation found cancer had been present.

Kensington Palace has not said what type of cancer she has.

A spokesperson said: "We will not be sharing any further private medical information. The princess has a right to medical privacy as we all do."

Catherine said her medical team advised she should undergo "preventative chemotherapy" and she is in the early stages of this treatment.

Chemotherapy is a catch-all term for medication to kill cancer cells - it can be given via a drip or in pill form.

How much you need and how often depends on the type of cancer and how it is growing. The aim is to reduce the risk of cancer remaining or coming back.

Bob Phillips, professor of paediatric oncology at the University of York, said chemotherapy can be used to "mop up" cancer cells if there are any still present.

After the surgery in January, which Kensington Palace says was successful, doctors performed tests which revealed cancer had been present.

Commonly, tissue removed during surgery would be sent to a lab for analysis and to see what cells are there.

Catherine's original operation took place at the London Clinic, a private facility.

The Palace is not commenting on where she is now receiving care. In her video message Catherine thanked the "fantastic medical team" who have been treating her.

Cancer occurs when cells in a specific part of the body divide in an uncontrolled way.

Untreated, these cells can potentially spread to other tissues in the body, including organs, which is known as secondary or metastatic cancer.

In the UK, one in two people develop some kind of cancer during their lifetime.

There are more than 200 different types of cancer - the most common ones in the UK are breast, lung, prostate and bowel, according to the NHS UK website.

Each cancer is diagnosed and treated in a particular way.

Anyone can develop cancer, but the risk goes up the older we become because there's more time for cell damage to build up.

Survival from cancer has doubled in the last 50 years.

If you notice something that isn't normal for you, see a doctor.

The symptoms you are experiencing may not be cancer, but it is important to get checked.

Finding cancer early can often make it easier to treat.