Mastitis and Plugged Ducts: How Current Clinical Guidance Has Evolved

By Birth & Baby University · Last updated: October 2026 · 8 min read

For many years the standard advice for a tender, hard spot in a breast was familiar: apply heat, massage firmly toward the nipple, feed or pump often and empty the breast. Many parents and professionals still hear and give that advice. The Academy of Breastfeeding Medicine (ABM) published a revised protocol in 2022 that departs from much of it, and trial evidence on prevention and antibiotic treatment is thinner than many assume. Postpartum doulas are often the first person a parent tells about a sore, red area, so knowing what has changed, and what is still uncertain, matters for both safety and scope. This article describes the revised guidance, the trials, and the points where common advice and current protocols disagree.

Key takeaways

Quick answer: ABM Clinical Protocol #36 (2022) describes mastitis as a spectrum of inflammation, not a single infection, and says “plugged ducts” are better understood as ductal narrowing and inflammation than as a physical plug. It recommends feeding on demand without trying to empty the breast, minimizing pumping, avoiding deep massage, and using ice and anti-inflammatory measures as directed by a clinician. A parent with fever, spreading redness or a hard painful lump needs a clinician, not only home measures.

• ABM Protocol #36 replaces ABM Protocols #4 (Mastitis) and #20 (Engorgement), which were retired. It says it is not anatomically possible for a single duct to become obstructed by a macroscopic milk plug.
• The protocol says to feed on demand and not aim to empty the breasts, because milk volume depends on a feedback mechanism in which more removal increases production, and “pumping to empty” can perpetuate hyperlactation and worsen tissue edema.
• The protocol says to avoid deep massage, and notes a systematic review found massage may reduce pain but should not be standard of care because it requires extensive training to do without causing trauma.
• A Cochrane review of mastitis prevention found low-certainty evidence that probiotics may reduce mastitis risk (risk ratio 0.51), and an older Cochrane review found insufficient evidence to confirm or refute antibiotic effectiveness for treating lactational mastitis.

What the research says

The revised protocol. The ABM’s Clinical Protocol #36: The Mastitis Spectrum, Revised 2022 (Mitchell and colleagues) describes a spectrum from ductal narrowing and inflammatory mastitis to bacterial mastitis, phlegmon, abscess, galactocele and subacute mastitis, and treats early postpartum engorgement as a distinct condition. It says “plugging” is a colloquial term for microscopic ductal inflammation and narrowing, related to alveolar distension or changes in the breast’s microbiome, and that repeatedly feeding to relieve a “plug” can suppress the milk-production feedback inhibitor, increase production and exacerbate inflammation. Attempts to extrude a plug by squeezing or aggressive massage are, in the protocol’s words, ineffective and result in tissue trauma. Engorgement from the arrival of copious milk typically presents with bilateral breast pain, firmness and swelling between days 3 and 5 after birth, and can be later after cesarean birth.

For management, the protocol’s conservative measures include feeding the baby on demand without aiming to empty the breasts, expressing only small volumes by hand for comfort if needed, minimizing pump use (pumps stimulate production without extracting milk as an infant does), avoiding nipple shields, avoiding deep massage and topical products such as castor oil, and avoiding routine sterilization of pumps, since there is no evidence that poor hygiene causes bacterial mastitis and basic cleaning and handwashing suffice. For symptom relief, it lists ice and nonsteroidal anti-inflammatory drugs to reduce edema and inflammation with acetaminophen for analgesia, noting heat may worsen swelling though some find it comforting, and that a randomized controlled trial of warm showers and antipyretics did not improve outcomes. It suggests oral lecithin as a measure to reduce duct inflammation. The protocol grades each measure with levels of evidence 1 to 3 and the strength of recommendation taxonomy (A, B or C), and most of the conservative measures described here are graded C, the lowest of the three letters, with the lymphatic-drainage statement graded B. It says an evaluation by a medical professional should occur if systemic symptoms such as fever and fast heart rate persist beyond 24 hours, notes that about 3% to 11% of women with acute mastitis develop an abscess, and says bacterial mastitis is not contagious and does not require interrupting breastfeeding. Drug dosing is a clinical matter and is not reproduced here.

How this contrasts with other advice. The AAP’s Warning Signs of Breastfeeding Problems (last updated March 2024) says that for severe engorgement, hard painful breasts may prevent latching and parents may need to express milk manually or with an electric pump until the breasts soften, adding that severe unrelieved engorgement can decrease milk supply. It also lists severe pain, and fullness that does not ease after a feed, as reasons to seek help, and mentions mastitis among causes to check for. That is not the same emphasis as the ABM’s caution about pumping, although both stress getting skilled help and neither describes the other as wrong. The differing advice is one reason a doula should not present one rule, and should refer a parent to their own clinician.

What trials show. Crepinsek and colleagues’ Cochrane review of preventing mastitis (2020) included 10 trials with 3,034 women. Probiotics may reduce the risk of mastitis compared with placebo (risk ratio 0.51, 95% confidence interval 0.35 to 0.75; two trials, 399 women; low-certainty evidence), though the results of the largest probiotic trial were unavailable because of a contractual agreement with the supplier. The risk of mastitis may be similar between antibiotics and usual care or placebo (risk ratio 0.37, 95% confidence interval 0.10 to 1.34; three trials; low-certainty evidence). The review notes that there were almost no data on adverse effects, breast pain, duration of breastfeeding, nipple damage, abscess or recurrence, and that industry funding may have affected the evidence. For treatment, Jahanfar, Ng and Teng’s Cochrane review of antibiotics (2013) found two trials and concluded there is insufficient evidence to confirm or refute the effectiveness of antibiotic therapy for lactational mastitis, and called for high-quality double-blinded trials. In practice clinicians decide on antibiotics for suspected bacterial mastitis, and ABM Protocol #36 says that bacterial mastitis represents a progression that necessitates antibiotics or probiotics to resolve.

What this means for doulas

• Know that guidance changed. If a parent’s friend, a book or an older handout says to massage firmly, pump to empty or sterilize everything, you can explain that the 2022 protocol recommends otherwise and that the parent can ask their clinician.
• Offer comfort measures within scope. Support responsive feeding, gentle positioning and cold packs for comfort, and reassure that lactating breasts can feel lumpy and tender. Do not give medication advice or doses.
• Avoid firm massage and tools. The protocol advises against deep massage, vibrating devices and topical remedies. It does say edema may resolve more quickly with ice and lymphatic drainage using light sweeping of the skin rather than deep tissue massage, so any technique should be shown by a lactation professional or clinician, not improvised.
• Recognize warning signs. Fever, chills, a fast heartbeat, a hard red wedge, a painful lump that does not resolve, or a parent who feels flu-like should be seen. The protocol’s threshold is persistent systemic symptoms beyond 24 hours, and a parent who is unwell should not wait.
• Do not suggest stopping breastfeeding. The protocol says bacterial mastitis does not require interruption of breastfeeding. Whether to feed from an affected breast is for the clinician and parent to decide.

Putting the evidence into practice

1. Ask about symptoms and timing. One area or both breasts, how long, any fever or chills, any recent change in feeding or pumping.
2. Review feeding and pumping habits. Is the parent pumping after every feed to empty? Mention that the protocol recommends removing only what the baby needs and refer to a lactation professional for a plan.
3. Encourage prompt contact with a clinician for fever, worsening redness or swelling, pus, or a lump that persists, and make it easy by helping the parent find the number.
4. Support rest, fluids and food. Practical help with the household matters when a parent is unwell.
5. Link to related topics. See Understanding Milk Production: The Hormonal and Physiological Science of Lactation and Exclusive Pumping: Evidence-Based Strategies for Supporting Families.

Limits and uncertainty

ABM Protocol #36 is expert guidance with recommendations graded as weak, not a set of trial results, and it makes strong statements on topics where trial evidence is limited. The Cochrane prevention review rates its evidence as low certainty and notes industry involvement. The antibiotic review is from 2013 and found only two small trials. This article draws on the full text of the protocol and the AAP page and the abstracts of the Cochrane reviews. Guidance continues to change, so check for a newer ABM protocol. Individual parents with recurrent mastitis, abscess, a history of breast surgery or other conditions require individualized care from their clinician.

The bottom line

Current ABM guidance treats mastitis as a spectrum and discourages many once-routine practices: pumping to empty, deep massage, and routine sterilization. Trial evidence for prevention and antibiotic treatment is limited, and professional sources do not all give identical advice. A doula can help parents understand that sore, firm areas are common, support responsive feeding and comfort, and make sure anyone with fever, spreading redness or a persistent lump reaches a clinician quickly.

Birth & Baby University’s For Doulas page brings together its postpartum doula training, recertification and mentorship for doulas who support families through feeding challenges. Confirm that any program meets your certifier’s, employer’s or state’s requirements before you enroll.

This article is for professional education. It is not medical, legal or tax advice. Check the standards of your certifying organization and the rules where you work. For concerns about a baby’s health, contact a pediatric provider or emergency services.

Sources and further reading

• Mitchell KB, et al.; Academy of Breastfeeding Medicine. ABM Clinical Protocol #36: The Mastitis Spectrum, Revised 2022. Breastfeeding Medicine (2022). Read the source
• American Academy of Pediatrics. Warning Signs of Breastfeeding Problems (HealthyChildren.org, last updated March 2024). Read the source
• Crepinsek MA, et al. Interventions for preventing mastitis after childbirth. Cochrane Database of Systematic Reviews (2020). Read the source
• Jahanfar S, Ng CJ, Teng CL. Antibiotics for mastitis in breastfeeding women. Cochrane Database of Systematic Reviews (2013). Read the source

More for professionals: the Professionals Blog.