Mastitis and a milk clot

A narrowed milk duct or local swelling may create a firm, sore area. Mastitis describes inflammation of breast tissue; it can occur with milk stasis and may bring warmth, redness, swelling or flu-like feelings. The word clot can be misleading because milk is not usually a blood clot inside the breast.

A painful breast or painful feeding can have other causes, including shallow attachment, nipple injury or an abscess. Examination matters if the area is not improving, because a clinician may need to distinguish inflammation from a collection of pus or another lump.

Continue feeding or expressing in a comfortable pattern if you wish, but do not forcefully empty the breast or use deep massage over the sore area. Rest, drink to thirst, use cool packs for swelling, and check that the baby is well attached. A [Lactation Consultation](/treatments/pregnancy-and-birth-care/lactation-consultation/) can help identify pressure points and feeding adjustments.

Record the location and size of the firm area and whether it changes after feeding. Avoid tight clothing or pressure on the breast. Do not puncture the skin or use antibiotics without professional advice.

Contact a clinician promptly for worsening redness, increasing pain, fever, chills, marked weakness, or a lump that remains firm. Urgent care is needed if you feel severely unwell, have difficulty breathing, or cannot keep fluids down. Seek assessment for bloody discharge or a persistent lump even if feeding changes the discomfort.

Is this milk stasis, mastitis, an abscess, or another breast problem? Should I change feeding or expressing? What signs mean I need a same-day review?