Glossary

Term · Feeding Your Baby

ductal narrowing

Also: clogged duct, blocked duct

A tender, hard area in the breast from a milk duct that is not draining well. It is the early end of the spectrum that can become mastitis.

In plain words

Ductal narrowing describes a milk duct that is not draining well. Mothers often call it a clogged duct or a . The breast may feel tender, with a firm, sore lump that changes shape as milk moves. Warmth and redness can come with it. Frequent feeding and a good latch are common steps mothers try. Most clogged ducts clear within a day or two. Some turn into , an inflammation that can include fever, chills, and feeling unwell. Fever, a red area that spreads, or feeling ill is a same-day call to a provider. A breast that does not improve with home steps is a reason to call a provider the same day.

The deeper version

Ductal narrowing is the first point on a spectrum that runs from ductal narrowing through , , , and abscess, with and as related states. The Academy of Breastfeeding Medicine Clinical Protocol 36 on mastitis (2022) reframed the condition this way, shifting from a binary model of infection to a continuum that includes noninfectious inflammation. Milk stasis, poor drainage, and external pressure are the main mechanical drivers. Evidence for antibiotic use in mastitis is mixed, and the protocol emphasizes feeding on demand and early reassessment. Controversy persists about the role of bacterial culture and about the threshold at which infection requires treatment.

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Sources

  • Academy of Breastfeeding Medicine — Clinical Protocol 36: Mastitis, revised 2022
  • Academy of Breastfeeding Medicine — Clinical Protocol 3: Hospital guidelines for supplemental feedings in the term breastfed neonate

The Mothership Topic Wiki is general information for mothers and the people who care for them. It is not medical, legal, or mental-health advice and does not create a provider relationship. Experiences posted by members are their own. In an emergency call 911. If you are having thoughts of harming yourself, call or text 988.