On the day of breast cancer surgery

On the day of your operation, you will need to stop eating for several hours before surgery. Your nurse will go through some questions and prepare you for surgery. You will also meet your anaesthetist. They are in control of keeping you asleep during the operation by giving you an anaesthetic Open a glossary item

You see your surgeon on the day of your operation. They will explain:

  • what they are going to do
  • the possible side effects
  • where you’ll have scars
  • what to expect after the operation

The surgeon uses a marker pen to draw an outline on your skin to clearly show the area of the operation. The marks may be on your breast and under your arm.

You sign a consent form for the operation if you didn't do it at the pre assessment clinic.

The surgeon, anaesthetist and nurse can answer any questions about your operation you may have.

Before the operation

On the day of the operation you:

  • stop eating for about 6 hours before your operation, but you can still drink clear fluids (nothing fizzy) up to 2 hours beforehand
  • change into a hospital gown
  • take off jewellery (except for a wedding ring)
  • put on a pair of surgical stockings
  • take off any make up, including nail varnish
  • remove contact lenses if you have them

If you have false teeth or wear glasses you can usually keep them with you until you get to the anaesthetic room.

For some types of surgery, you may need to remove some of your hair around the operation area. The nurse might do this for you when you’re under anaesthetic in the operating room.

Your nurse might give you a tablet or an injection to help you relax. This will be an hour or so before you go to the operating theatre. This makes your mouth feel dry. But you can rinse your mouth with water to keep it moist. 

Your nurse and a porter take you to theatre on a trolley if you’ve had this medicine. You can walk down to the theatre if you haven't had any.

If your breast cancer is too small for the surgeon to feel

If you have a very small cancer that is too small to feel, usually on the morning of the operation you might have a very thin wire put into the breast tissue. They do this in the radiology department with a mammogram or ultrasound scan. This helps the surgeon find the exact area that needs removing during the operation. This is called wire guided localisation or wired guide local excision.

Some hospitals might use small magnetic markers, instead of using a wire. Magseed is one of the magnetic markers in use. If you are having a magnetic marker you have this put in several days or weeks before surgery. 

Having an anaesthetic

You have an anaesthetic so that you can’t feel anything during the operation. You have this in the anaesthetic room, next to the operating theatre.

All the doctors and nurses wear theatre gowns, hats and masks. This reduces your chance of getting an infection.

The anaesthetist puts a small tube (cannula) into a vein in your arm. You have any fluids and medicines you need through the cannula including the general anaesthetic. This sends you into a deep sleep. When you wake up, the operation will be over.

The anaesthetist might inject an anaesthetic into the area of the surgery so that you don't have any pain there when you wake up.

Waking up after surgery

After the operation, you usually wake up in the recovery room, before moving back to your ward.

  • Oxford Handbook of Clinical Surgery (5th Edition)
    A Agarwal and others
    Oxford University Press Incorporated, June 2022

  • Oncoplastic Breast Surgery: A Practical Guide
    MW Kissin and others
    Taylor and Francis Group, January 2023

  • Magseed for locating impalpable breast cancer lesions
    National Institute for Health and Care Excellence (NICE), November 2020

  • Preoperative localisation of nonpalpable breast lesions using magnetic markers in a tertiary cancer centre
    A Petrillo and others
    European Radiology Experimental, December 2022. Volume 6, Issue 8

  • The Royal Marsden Manual of Clinical and Cancer Nursing Procedures (10th edition)
    S Lister, J Hofland and H Grafton
    Wiley Blackwell, 2020

  • The information on this page is based on literature searches and specialist checking. We used many references and there are too many to list here. Please contact patientinformation@cancer.org.uk with details of the particular issue you are interested in if you need additional references for this information.

Last reviewed: 
07 Jul 2023
Next review due: 
07 Jul 2026

Related links