Signs and symptoms of breast cancer Remember, lumps in the breast are very common, especially just before your period. Most lumps are not breast cancer. Most often breast cancer is first noticed as a painless lump in the breast or armpit. You or your partner may discover the lump, or your doctor may find it during a routine physical exam or screening mammogram. Other signs might include: lump or swelling in the armpit changes in breast size or shape dimpling or puckering of the … [Read more...]