Breast cancer is the presence of a malignant breast nodule, mass or abscess.
Most common symptom of breast cancer is a new lump or mass in the breast. The lump or mass is usually painless, hard and irregular but it can also be tender, soft, rounded or painful.
Other signs and symptoms include breast pain or nipple pain, nipple discharge, nipple retraction and presence of breast skin changes (eg peau d' orange, nipple excoriation, scaling, inflammation, skin tethering, ulceration, abscess).