What is breast cancer?
Cancer occurs when changes called mutations take place in genes that regulate cell growth. The mutations let the cells divide and multiply in an uncontrolled way.
Breast cancer is cancer that develops in breast cells. Typically, the cancer forms in either the lobules or the ducts of the breast.
Lobules are the glands that produce milk, and ducts are the pathways that bring the milk from the glands to the nipple. Cancer can also occur in the fatty tissue or the fibrous connective tissue within your breast.
The uncontrolled cancer cells often invade other healthy breast tissue and can travel to the lymph nodes under the arms. Once the cancer enters the lymph nodes, it has access to a pathway to move to other parts of the body.
See pictures and learn more about the structure of the breast.
Signs and symptoms of breast cancer
In its early stages, breast cancer may not cause any symptoms. In many cases, a tumor may be too small to be felt, but an abnormality can still be seen on a mammogram.
If a tumor can be felt, the first sign is usually a new lump in the breast that was not there before. However, not all lumps are cancer.
Each type of breast cancer can cause a variety of symptoms. Many of these symptoms are similar, but some can be different. Symptoms for the most common breast cancers include:
a breast lump or tissue thickening that feels different from surrounding tissue and is new
breast pain
red or discolored, pitted skin on the breast
swelling in all or part of your breast
a nipple discharge other than breast milk
bloody discharge from your nipple
peeling, scaling, or flaking of skin on your nipple or breast
a sudden, unexplained change in the shape or size of your breast
inverted nipple
changes to the appearance of the skin on your breasts
a lump or swelling under your arm
If you have any of these symptoms, it doesn’t necessarily mean you have breast cancer. For instance, pain in your breast or a breast lump can be caused by a benign cyst.
Still, if you find a lump in your breast or have other symptoms, contact your doctor for further examination and testing.
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