In its early stages, breast cancer usually has no symptoms. As a tumor develops, you may note the following signs:
A lump in the breast or underarm that persists after your menstrual cycle. This is often the first apparent symptom of breast cancer. Lumps associated with breast cancer are usually painless, although some may cause a prickly sensation. Lumps are usually visible on a mammogram long before they can be seen or felt.
Swelling in the armpit.
Pain or tenderness in the breast. Although...