Mastitis when milk comes in: what to know

As milk production increases after birth, the breasts may feel full, firm, or uneven. Inflammation can develop when milk is not moving comfortably, when the nipple is irritated, or when feeding changes suddenly. One area may feel hot, sore, or wedge-shaped, and the skin can look red. Feeling tired, achy, feverish, or generally unwell can occur. A breast lump is not automatically mastitis; several breast changes have similar features and need assessment if they persist.

Continue breastfeeding or expressing in a way that feels manageable; abrupt stopping can worsen fullness. Check that the baby is well positioned and attached, and avoid forceful massage or repeated pumping to empty the breast. Rest, drink to thirst, and use a cool pack wrapped in cloth for comfort. A lactation consultation can help adjust attachment, feeding patterns, and breast comfort. Ask a clinician which pain or fever medicine is suitable for you, especially after birth or if you take other medicines.

Contact a healthcare professional promptly if you feel feverish or unwell, the redness or pain is spreading, or symptoms are not easing with supportive care. Urgent assessment is needed for severe weakness, confusion, trouble breathing, or a rapidly enlarging painful swelling. A clinician may check for infection or an abscess and decide whether prescription treatment is needed.

Could this be inflammation, an infection, or another breast problem? How should I feed or express while it settles? Which medicines are compatible with breastfeeding and my health history?