How common is a breast lump in a blocked milk duct?

A blocked milk duct can cause a localised tender, firm, or wedge-shaped area while breastfeeding or expressing. The breast may feel fuller in one spot, and the lump may change after milk removal. Pressure from a tight bra, a missed feed, or positioning that does not drain that area may contribute.

A lump can also occur with breast inflammation, infection, a cyst, or another breast condition. A clinician should assess a lump that does not improve, keeps returning, or feels unlike your usual breastfeeding changes. Do not use the lump alone to decide its cause.

Continue breastfeeding or expressing according to your baby’s usual needs, without trying to empty the breast repeatedly. Check that clothing and bra straps are not pressing on the area. Rest, drink to thirst, and use a cool pack wrapped in cloth for comfort. Gentle handling is preferable to deep massage, which can worsen swelling.

Arrange a review if symptoms are not settling, or if you develop increasing redness, warmth, pain, or fever. A clinician can check for mastitis or an abscess and advise whether treatment or imaging is needed. Keep feeding unless a clinician tells you otherwise.

Seek prompt care for fever, chills, rapidly spreading redness, severe pain, pus, feeling very unwell, or a lump that becomes soft in the centre. Arrange breast assessment for any persistent lump, bloody nipple discharge, skin dimpling, or a nipple change that is new for you.

Ask: Does this feel like a blocked duct or an infection? How long should I monitor it? Should I continue breastfeeding or expressing? Do I need imaging? Which changes mean I should return urgently?