Sore nipples usually mean irritation or hormone-related sensitivity , and the most common causes are a coming period, pregnancy, breastfeeding, friction from clothing or exercise, skin irritation, or an infection. It’s rarely a sign of something serious, but pain that doesn’t go away or comes with other symptoms should be checked.

Common reasons

  • Hormonal changes: periods, ovulation, pregnancy, and breastfeeding can make nipples tender.
  • Friction or chafing: tight bras, rough fabrics, running, or repeated rubbing can cause soreness.
  • Skin irritation: soaps, detergents, lotions, eczema, or dermatitis can inflame the area.
  • Infection: redness, swelling, heat, discharge, or fever can point to mastitis, thrush, or another infection.

When to get checked

See a clinician sooner if the soreness is:

  • Only on one side and keeps getting worse.
  • With a lump, nipple discharge, skin thickening, or nipple turning inward.
  • With fever, pus, spreading redness, or severe pain.

What can help

  • Wear a supportive, well-fitting bra.
  • Avoid harsh soaps and scented products.
  • Use a gentle moisturizer if the skin is dry or irritated.
  • If breastfeeding, check latch and seek lactation help if feeding is painful.

If the soreness started recently and there’s any chance of pregnancy, a test can help rule that out quickly.