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SIGNS AND SYMPTOMS OF BREAST CANCER

Signs and symptoms of breast cancer may include:

A breast lump or thickening that feels different from the surrounding tissueChange in the size, shape or appearance of a breastChanges to the skin over the breast, such as dimplingA newly inverted nipplePeeling, scaling or flaking of the pigmented area of skin surrounding the nipple (areola) or breast skinRedness or pitting of the skin over your breast, like the skin of an orange

Causes

It's not clear what causes breast cancer.

Doctors know that breast cancer occurs when some breast cells begin growing abnormally. These cells divide more rapidly than healthy cells do and continue to accumulate, forming a lump or mass. The cells may spread (metastasize) through your breast to your lymph nodes or to other parts of your body.

Breast cancer most often begins with cells in the milk-producing ducts (invasive ductal carcinoma). Breast cancer may also begin in the glandular tissue called lobules (invasive lobular carcinoma) or in other cells or tissue within the breast.

Researchers have identified hormonal, lifestyle and environmental factors that may increase your risk of breast cancer. But it's not clear why some people who have no risk factors develop cancer, yet other people with risk factors never do. It's likely that breast cancer is caused by a complex interaction of your genetic makeup and your environment.

Inherited breast cancer

Doctors estimate that about 5 to 10 percent of breast cancers are linked to gene mutations passed through generations of a family.

A number of inherited mutated genes that can increase the likelihood of breast cancer have been identified. The most common are breast cancer gene 1 (BRCA1) and breast cancer gene 2 (BRCA2), both of which significantly increase the risk of both breast and ovarian cancer.

If you have a strong family history of breast cancer or other cancers, your doctor may recommend a blood test to help identify specific mutations in BRCA or other genes that are being passed through your family.

Consider asking your doctor for a referral to a genetic counselor, who can review your family health history. A genetic counselor can also discuss the benefits, risks and limitations of genetic testing with you and guide you on appropriate genetic testing.

Risk factors

A breast cancer risk factor is anything that makes it more likely you'll get breast cancer. But having one or even several breast cancer risk factors doesn't necessarily mean you'll develop breast cancer. Many women who develop breast cancer have no known risk factors other than simply being women.

Factors that are associated with an increased risk of breast cancer include:

Being female. Women are much more likely than men are to develop breast cancer.Increasing age. Your risk of breast cancer increases as you age.A personal history of breast cancer.If you've had breast cancer in one breast, you have an increased risk of developing cancer in the other breast.A family history of breast cancer. If your mother, sister or daughter was diagnosed with breast cancer, particularly at a young age, your risk of breast cancer is increased. Still, the majority of people diagnosed with breast cancer have no family history of the disease.Inherited genes that increase cancer risk. Certain gene mutations that increase the risk of breast cancer can be passed from parents to children. The most common gene mutations are referred to as BRCA1 and BRCA2. These genes can greatly increase your risk of breast cancer and other cancers, but they don't make cancer inevitable.Radiation exposure. If you received radiation treatments to your chest as a child or young adult, your risk of breast cancer is increased.Obesity. Being obese increases your risk of breast cancer.Beginning your period at a younger age. Beginning your period before age 12 increases your risk of breast cancer.Beginning menopause at an older age. If you began menopause at an older age, you're more likely to develop breast cancer.Having your first child at an older age. Women who give birth to their first child after age 30 may have an increased risk of breast cancer.Having never been pregnant. Women who have never been pregnant have a greater risk of breast cancer than do women who have had one or more pregnancies.Postmenopausal hormone therapy.Women who take hormone therapy medications that combine estrogen and progesterone to treat the signs and symptoms of menopause have an increased risk of breast cancer. The risk of breast cancer decreases when women stop taking these medications.Drinking alcohol. Drinking alcohol increases the risk of breast cancer.

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