What are the early signs of breast cancer?

Bottom lineThe most common early sign is a new painless lump in the breast or armpit, followed by skin dimpling, nipple inversion or discharge, size or shape changes, and rapid redness or swelling - but the earliest breast cancers usually cause no symptoms at all, which is why routine mammograms from age 40 matter more than any symptom list.

The most common first sign is a new, painless lump in the breast or armpit - typically hard, with irregular edges, and fixed in place, though some cancers are soft, round, or tender. But breast cancer can announce itself in quieter ways, and the earliest stage often has no symptoms at all, which is why screening matters so much.

Signs to know

• A new lump or thickening in the breast or armpit that feels different from surrounding tissue
• Change in size or shape of one breast
• Skin changes: dimpling, puckering, thickening, or an orange-peel texture
• Nipple changes: newly turned inward, discharge (especially bloody or from one side), scaling, or a rash around the nipple
• Redness, swelling, or warmth - if this develops quickly, sometimes with pain, it can signal inflammatory breast cancer, a rare but aggressive form that often has no lump at all
• Persistent pain in one spot - uncommon as a first sign (most breast pain is hormonal or benign), but worth checking when it is fixed and unexplained

The uncomfortable truth about "early"

By the time a cancer is big enough to feel - usually 1-2 cm - it has often been growing for years. Mammograms find cancers at a few millimeters, long before any sign appears. That is why the earliest "sign" for many women is a screening callback, not a symptom, and why routine mammograms (from age 40 for average-risk women) do the heavy lifting that self-checks cannot.

What to do with this list

Know your normal - a monthly self-check a few days after your period builds that baseline. Report any change from it promptly: most turn out benign, but the ones that are not are dramatically more treatable when caught early. And keep every screening appointment regardless of how your breasts look and feel - no symptom list, and no self-exam, replaces medical care.

Related: what breast changes need a doctor · can a self-exam replace a mammogram · breast self-exam guide