This topic is for women
who have been diagnosed with breast cancer for the first time. If you are
looking for information on breast cancer that has spread or come back after
treatment, see the topic
Breast Cancer, Metastatic or Recurrent.
For male breast cancer, see the topic Breast Cancer in Men.
Breast cancer occurs when abnormal cells grow out of control in one or both
breasts. They can invade nearby tissues and form a mass, called a malignant
tumor. The cancer cells can spread (metastasize) to the
lymph nodes and other parts of the body.
Breast cancer that begins in the ducts of the breast is called ductal carcinoma. It is the most common type of breast cancer.
Doctors don't know exactly what
causes breast cancer. But some things are known to increase the chance that you
will get it. These are called risk factors. Risk factors
that you cannot change include getting older and having changes to certain genes. Risk factors you may be able to change include using certain types of
hormone therapy after menopause, being overweight, and not getting enough physical activity.
But many women who have risk factors don't get breast cancer. And many women who get breast cancer don't have any
known risk factors other than being female and getting
Breast cancer can
- A change in the way the breast feels. The
most common symptom is a painless lump or thickening in the breast or
- A change in the way the breast looks. The skin on the
breast may dimple or look like an orange peel. There may be a change in the
size or shape of the breast.
- A change in the nipple. It may turn
in. The skin around it may look scaly.
- A fluid that
comes out of the nipple.
See your doctor right away if you notice any of these
During a regular physical exam, your doctor can check your breasts to look for lumps or changes. Depending on your age and risk factors, the doctor may advise you to have a mammogram, which is an X-ray of the breast. A mammogram can often find a lump that is too small to be felt. Sometimes a woman finds a lump during a breast self-exam.