The most common symptom of breast cancer is a new lump or mass (although most breast lumps are benign). 

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Additional signs include:

• Swelling of all or part of a breast (even if no lump is felt)

• Skin dimpling (the appearance of an orange peel)

• Breast or nipple pain

• Nipple retraction (turning inward)

• Nipple or breast skin that is red, dry, flaking, or thickened

• Nipple discharge (other than breast milk)

• Swollen lymph nodes under the arm (axillary) or near the collar bone