Mammography
A mammogram is a special X-ray of the breast that uses a low dose of radiation to create detailed images of the breast tissue. It is the main test used to screen for breast cancer and can reveal changes long before they can be felt.
Overview
What is a mammogram?
A mammogram is an X-ray picture of the breast taken with a low dose of radiation. The breast is gently flattened between two plates so the imaging plate can capture clear, detailed views of the tissue. Because it can show very small changes deep inside the breast, mammography is the standard tool used to look for early signs of breast cancer.
Why is a mammogram done?
Mammograms are mainly used to screen healthy women for breast cancer before any symptoms appear, when treatment tends to be most effective. They are also used to investigate a specific concern, such as a new lump, thickening, pain, or nipple change. Detecting cancer at an early stage often means simpler treatment and better outcomes.
Test Details
How do I prepare for a mammogram?
Little preparation is needed. On the day of your scan, avoid using deodorant, talcum powder, perfume, or lotion on your chest and underarms, as these can show up on the images and blur the results. Wearing a two-piece outfit makes it easy to undress from the waist up. Tell the team if you might be pregnant or are breastfeeding.
What happens during a mammogram?
You will undress from the waist up and stand in front of the X-ray machine. A radiographer positions one breast at a time on a flat plate, and a second plate presses down to flatten it for a few seconds while the image is taken. Usually two views of each breast are captured. The whole appointment generally takes only a few minutes.
Results and Follow-Up
What happens after the test, and what do the results show?
A specialist doctor reviews your images and sends a written result, often within a couple of weeks. Most mammograms are normal. If an area looks unclear or unusual, you may be invited back for more pictures, an ultrasound, or sometimes a biopsy. Being recalled is common and does not mean you have cancer; it simply allows a closer look.
Additional Common Questions
Is the radiation from a mammogram dangerous?
The dose of radiation used is very low, and the benefit of finding cancer early is generally considered to far outweigh the small risk. If you might be pregnant, let the team know first.
Does a mammogram hurt?
Pressing the breast can feel uncomfortable or briefly painful, but it only lasts a few seconds per image. Booking your appointment shortly after your period, when breasts are less tender, can help.
How often should I have a mammogram?
Screening intervals depend on your age, personal risk, and local guidelines. Your doctor can advise on the schedule that is right for you.
Sources
This health topic is for general information and is not a substitute for professional medical advice. Always consult a qualified clinician about your individual situation. See our medical disclaimer.
