National Cancer Institute
U.S. National Institutes of Health | www.cancer.gov

NCI Home
Cancer Topics
Clinical Trials
Cancer Statistics
Research & Funding
News
About NCI

What You Need To Know About™

Breast Cancer

In English     En español
    Posted: 07/30/2005    Updated: 11/01/2007



Introduction






The Breasts






Understanding Cancer






Risk Factors






Screening






Symptoms






Diagnosis






Additional Tests






Staging






Treatment






Breast Reconstruction






Complementary and Alternative Medicine






Nutrition and Physical Activity






Follow-up Care






Sources of Support






The Promise of Cancer Research






National Cancer Institute Information Resources






National Cancer Institute Publications



Page Options
Print This Page
Print This Document
View Entire Document
E-Mail This Document
View/Print PDF
Order Free Copy
Quick Links
Director's Corner

Dictionary of Cancer Terms

NCI Drug Dictionary

Funding Opportunities

NCI Publications

Advisory Boards and Groups

Science Serving People

Español
Quit Smoking Today
NCI Highlights
Report to Nation Finds Declines in Cancer Incidence, Death Rates

High Dose Chemotherapy Prolongs Survival for Leukemia

Prostate Cancer Study Shows No Benefit for Selenium, Vitamin E

The Nation's Investment in Cancer Research FY 2009

Past Highlights
Screening

Screening Mammogram
Clinical Breast Exam
Breast Self-Exam

Screening for breast cancer before there are symptoms can be important. Screening can help doctors find and treat cancer early. Treatment is more likely to work well when cancer is found early.

Your doctor may suggest the following screening tests for breast cancer:

You should ask your doctor about when to start and how often to check for breast cancer.

Screening Mammogram

To find breast cancer early, NCI recommends that:

  • Women in their 40s and older should have mammograms every 1 to 2 years. A mammogram is a picture of the breast made with x-rays.
  • Women who are younger than 40 and have risk factors for breast cancer should ask their health care provider whether to have mammograms and how often to have them.

Mammograms can often show a breast lump before it can be felt. They also can show a cluster of tiny specks of calcium. These specks are called microcalcifications. Lumps or specks can be from cancer, precancerous cells, or other conditions. Further tests are needed to find out if abnormal cells are present.

If an abnormal area shows up on your mammogram, you may need to have more x-rays. You also may need a biopsy. A biopsy is the only way to tell for sure if cancer is present. (The "Diagnosis" section has more information on biopsy.)

Mammograms are the best tool doctors have to find breast cancer early. However, mammograms are not perfect:

  • A mammogram may miss some cancers. (The result is called a "false negative.")
  • A mammogram may show things that turn out not to be cancer. (The result is called a "false positive.")
  • Some fast-growing tumors may grow large or spread to other parts of the body before a mammogram detects them.

Mammograms (as well as dental x-rays, and other routine x-rays) use very small doses of radiation. The risk of any harm is very slight, but repeated x-rays could cause problems. The benefits nearly always outweigh the risk. You should talk with your health care provider about the need for each x-ray. You should also ask for shields to protect parts of your body that are not in the picture.

Clinical Breast Exam

During a clinical breast exam, your health care provider checks your breasts. You may be asked to raise your arms over your head, let them hang by your sides, or press your hands against your hips.

Your health care provider looks for differences in size or shape between your breasts. The skin of your breasts is checked for a rash, dimpling, or other abnormal signs. Your nipples may be squeezed to check for fluid.

Using the pads of the fingers to feel for lumps, your health care provider checks your entire breast, underarm, and collarbone area. A lump is generally the size of a pea before anyone can feel it. The exam is done on one side, then the other. Your health care provider checks the lymph nodes near the breast to see if they are enlarged.

A thorough clinical breast exam may take about 10 minutes.

Breast Self-Exam

You may perform monthly breast self-exams to check for any changes in your breasts. It is important to remember that changes can occur because of aging, your menstrual cycle, pregnancy, menopause, or taking birth control pills or other hormones. It is normal for breasts to feel a little lumpy and uneven. Also, it is common for your breasts to be swollen and tender right before or during your menstrual period.

You should contact your health care provider if you notice any unusual changes in your breasts.

Breast self-exams cannot replace regular screening mammograms and clinical breast exams. Studies have not shown that breast self-exams alone reduce the number of deaths from breast cancer.

You may want to ask the doctor the following questions about screening:

  • Which tests do you recommend for me? Why?
  • Do the tests hurt? Are there any risks?
  • How much do mammograms cost? Will my health insurance pay for them?
  • How soon after the mammogram will I learn the results?
  • If the results show a problem, how will you learn if I have cancer?

Back to Top

< Previous Section  |  Next Section >


A Service of the National Cancer Institute
Department of Health and Human Services National Institutes of Health USA.gov