Mastitis: What It Is, What Helps, and What the Old Advice Got Wrong

The 2022 guidelines flipped a lot of standard mastitis advice. Here’s what’s current, what’s changed, and what to do.

If you’ve dealt with mastitis while breastfeeding before, or you’ve read older advice about it, you were probably told to nurse or pump as often as possible, massage the lump firmly, and apply heat before every feed. In 2022, the Academy of Breastfeeding Medicine revised its clinical protocol on mastitis, and a good amount of that advice was reversed. Not tweaked – reversed.

This article walks through what mastitis actually is, what the current evidence supports, and where reasonable experts still disagree. We’ll flag that disagreement honestly rather than pretending the science is fully settled, because it isn’t.

What Mastitis Actually Is

Mastitis isn’t one single event, it’s a spectrum. Clinicians now describe it as a progression:

• Engorgement – breasts feel overly full, sometimes hard and uncomfortable, but there’s no fever or illness
• Ductal narrowing / inflammatory mastitis – localized swelling and tenderness from tissue inflammation, not yet an infection
• Bacterial mastitis – the inflammation progresses to true infection, usually with fever and flu-like symptoms
• Abscess – a pocket of pus forms and needs to be drained; antibiotics alone won’t resolve it

The newer understanding is that this whole spectrum is driven by inflammation and swelling in the ductal tissue, often worsened by producing more milk than the baby is removing (called hyperlactation), rather than by milk simply “sitting” in one spot and needing to be forced out.

Signs to Watch For

Typical mastitis symptoms, usually in one breast:

• A firm, tender, red, or warm area of the breast
• Pain that’s worse in one spot than the surrounding tissue
• Fever, chills, or body aches that come on fairly fast
• A general flu-like feeling

What Changed in 2022 (and Why It Matters)

For decades, mastitis was explained by “milk stasis” – the idea that milk gets stuck, backs up, and causes infection, so the fix was to nurse or pump more and massage it out. The Academy of Breastfeeding Medicine’s revised protocol states plainly that this theory has never actually been proven, and that some of the advice built on it may make things worse rather than better.

• Use ice or cold packs, not heat. Applying heat before and during feeds used to be standard advice; it’s now discouraged because heat can worsen inflammation and swelling.
• Feed or pump at your normal rhythm. Pumping to “empty” the breast after every feed used to be recommended; overstimulation can actually prolong the oversupply that’s often driving the inflammation.
• Use very gentle lymphatic drainage strokes, about as much pressure as petting a cat. Firm massage toward the nipple was once standard advice; it’s now discouraged because it can damage tissue.
• Keep breastfeeding. This one hasn’t changed. Continued feeding is safe for your baby and is part of treatment, whether or not you’re on antibiotics.

What Actually Helps at Home

Ice, not heat.

Cold packs for 15 to 20 minutes at a time help reduce inflammation and swelling.

Gentle lymphatic massage.

Very light sweeping strokes toward the underarm and collarbone, not deep or forceful pressure on the sore spot.

Anti-inflammatory pain relief.

Ibuprofen addresses both pain and inflammation; acetaminophen helps with pain and fever. Check with your provider on dosing, especially if you’re also on antibiotics.

Keep feeding at your normal pattern.

No need to add extra sessions or pump-to-empty on the affected side.

Supportive, not restrictive, bra.

Something that holds the breast without compressing the sore area.

Rest and fluids.

Your body is fighting inflammation, sometimes infection, and that takes real energy.

When Antibiotics Come In

Not every case of mastitis needs antibiotics. If symptoms are mild and improve within 24 to 48 hours of conservative care, you may not need them at all. If you have a fever, symptoms are getting worse, or nothing’s improved after a day or two, antibiotics are usually appropriate and effective – most people feel meaningfully better within 48 to 72 hours of starting them.

Antibiotics prescribed for mastitis are considered safe during breastfeeding. If symptoms haven’t improved after 48 hours on antibiotics, your provider may want to check for a resistant infection or an abscess, sometimes with an ultrasound.

Lowering Your Risk

• Avoid overproducing milk beyond what your baby needs; excess pumping “just in case” can drive hyperlactation
• Work with an IBCLC if latch pain or nipple damage is ongoing – damaged skin is a common entry point for infection
• Address engorgement and ductal narrowing early with ice and gentle drainage rather than waiting it out
• Don’t abruptly drop feeding sessions when weaning; taper gradually
• Manage stress and rest where you can – both affect immune function and milk regulation

A Note on the Evidence

The 2022 protocol update was a genuine shift, but it hasn’t been universally embraced. Some lactation researchers have pushed back, arguing that certain recommendations, like lymphatic massage and reduced pumping in hyperlactation, rest on thinner evidence than the protocol implies, and that the “milk stasis is unproven” framing overstates how settled the underlying science actually is. We’re presenting the current mainstream guidance here, while acknowledging that this is an active, evolving area rather than a fully closed case.

The Bottom Line

Mastitis is painful and frightening in the moment, but it is treatable, and continuing to breastfeed through it is safe for your baby. Ice instead of heat, gentle strokes instead of deep massage, your normal feeding rhythm instead of pumping to empty – small changes from what you may have been told before, but they’re grounded in where the evidence stands now.

If something doesn’t add up, or you’re getting worse instead of better, trust that and call your provider.

We’re here. Keep going.