Breast cancer is the most common invasive cancer and the second leading cause of cancer death for women. For a woman in the U.S., there is a 1 in 8 chance she will develop breast cancer. In rare instances, breast cancer can also affect men.
However, screening and treatment improves survival rates. According to the American Cancer Society, there are currently more than 3.8 million breast cancer survivors in the U.S.
Usually, the first symptom is an area of thickened tissue in the breast, or a lump in the breast or armpit. Most breast lumps are not cancerous but you should visit your doctor for an exam if you notice one.
Other symptoms to watch for:
Many women with breast cancer have no symptoms. This is why regular breast cancer screening is so important.