When to worry about painful breastfeeding with mastitis

Mastitis can cause a tender, firm or swollen area in one breast, warmth, redness and pain during or between feeds. You may also feel feverish, tired or generally unwell. Pain can come from inflammation and milk-flow changes, while cracked nipples or an attachment problem can add soreness. These symptoms can overlap with other breast problems, so a clinician may need to examine you if they persist or intensify.

Continue breastfeeding or expressing as your comfort allows; stopping suddenly can make breast fullness worse. Offer the affected breast in a position that feels manageable, check that your baby has a deep latch, and rest and drink fluids. A cool pack wrapped in cloth may reduce swelling after feeds. Avoid forceful massage, tight clothing and repeated pumping to empty the breast, because extra irritation can prolong inflammation. A pharmacist or clinician can advise on pain relief compatible with breastfeeding.

Contact a healthcare professional promptly if you have a high fever, shaking chills, feel faint or very unwell, or the redness and swelling are spreading. Seek urgent help for severe weakness, confusion, breathing difficulty or inability to keep fluids down. Arrange an assessment if symptoms are not easing, a lump remains, or you develop a fluctuant swelling or pus, since an abscess may need drainage. Do not wait if you are worried about your health or your baby is feeding poorly.

Ask whether your symptoms fit inflammatory mastitis or an infection, how to protect milk supply, which pain medicines suit you, and whether a persistent lump needs imaging or follow-up.