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About Cancer

Breast cancer

Breast cancer is cancer that starts in the breast tissue. The most common symptom is a lump or swelling. Treatment might include surgery, chemotherapy, hormone therapy, and radiotherapy.

What is breast cancer?

Breast cancer is cancer that starts in the breast tissue. It’s the most common cancer in the UK. It mainly affects women, but men can get it too.

Symptoms of breast cancer

Symptoms of breast cancer include a lump in the breast or changes in the size, shape or feel of your breast. See your GP if you have any of these symptoms or any other symptoms of breast cancer.

Getting diagnosed with breast cancer

You usually start by seeing your GP. Your GP will examine you and may refer you to a specialist breast clinic. Or you may have had breast changes picked up through breast screening.

Survival for breast cancer

Survival is generally very good for breast cancer, particularly if you are diagnosed early. This is probably because of screening, early diagnosis and improved treatment.

Treatment for breast cancer

Treatment for breast cancer depends on a number of factors. The main treatments are surgery, chemotherapy, radiotherapy, hormone therapy, and targeted and immunotherapy drugs.

Stages and grades of breast cancer

Your stage means how big the cancer is and whether it has spread. Your grade means how abnormal the cancer cells look under a microscope. This information helps your doctor decide which treatment you need.

Last reviewed: 15 Apr 2026

Next review due: 15 Apr 2029

Reviewed by: 

This section has been written, reviewed and updated by Cancer Research UK’s Patient Information Web Team. Thanks to the expert medical professionals and people affected by cancer who have helped to review this information.

  • Professor Ramsey Cutress (Consultant Surgeon and Professor of Breast Surgery)

  • Dr Andrea Stevens (Consultant Clinical Oncologist)

  • Dr Carmel Anandadas (Consultant Clinical Oncologist)

  • Mr Debasish Debnath (Consultant Oncoplastic and Reconstructive Breast Surgeon)

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