Mastitis: What It Is, Why It Happens and What Helps from an IBCLC
If you've ever woken up with a red, hot, achy spot on your breast and a fever that seems to come out of nowhere, you already know how fast mastitis can knock you down. One minute you're nursing your baby like normal, and the next you're shivering under a blanket wondering if you have the flu.
I've supported hundreds of families through mastitis in my years as an IBCLC, and I've also had it myself. It is miserable, it is scary in the moment, and it is treatable once you understand what's happening in your breast tissue.
What Mastitis Is
Mastitis is inflammation of the breast tissue. It can happen with or without an infection, which matters more than it might sound like. For a long time, the standard advice was "empty the breast as much as possible," but our understanding has changed quite a bit in the last several years.
We now know mastitis usually starts as inflammation, often from a narrowed milk duct or an area of tissue that isn't draining well. That inflammation causes swelling, which narrows the duct even more, which causes more inflammation. It's a cycle. Bacterial infection can develop on top of this, but it isn't always present, and it isn't always the starting point.
Common Symptoms
A firm, red, warm, or painful area on the breast
Breast tissue that feels lumpy or has a wedge-shaped patch of swelling
Fever, chills, or a flu-like achiness
Fatigue that feels disproportionate to how busy you've been
In some cases, a visible red streak
Symptoms can escalate quickly, sometimes within a matter of hours. If you feel like you're getting the flu while breastfeeding, mastitis should be at the top of your list of suspects.
What Puts You at Risk
Mastitis tends to show up around a few common triggers:
A sudden change in feeding or pumping frequency (a missed session, a long stretch of sleep from baby, weaning)
Pressure on the breast from an underwire, a tight sports bra, or even a seatbelt on a long car ride
A shallow latch or tongue tie that isn't draining the breast efficiently
Oversupply, particularly in the early weeks
Stress and exhaustion, because the immune system and inflammation are closely connected
What Helps
This is where I want to gently push back on some outdated advice you may have heard.
Skip the aggressive pumping and massage. Vigorous massage, hand expressing beyond what's comfortable, or pumping on top of every feed can increase inflammation and make things worse. The old "pump until empty, then pump again" approach isn't supported by current evidence.
Feed or pump to comfort, not to empty. Nurse on a normal schedule, and let your body do the work. Overstimulating the breast keeps the inflammatory cycle going.
Use cold, not heat, between feeds. Heat feels good in the moment but can increase swelling. Apply a cold pack no more than 1-3x times per day, for up to five minutes at a time, directly on the affected ductal area that feels sore and inflamed.
Rest more than feels reasonable. I know this is close to impossible with a newborn or older kids at home, but your body needs the recovery time. Ask for help, cancel what you can, and lie down when the baby naps.
Gentle lymphatic drainage and breast gymnastics lymphatic massage is massaging the breast toward the underarm, rather than deep massage of the lump itself, this can support circulation without adding trauma to already inflamed tissue.
As well as breast gymnastics which can help relieve pressure on the swollen fascia of the impacted breast and provide relief https://www.youtube.com/watch?v=fHD90LlCkGc
https://www.youtube.com/watch?v=kdMmYYAFDMg
When to Call Your Provider
Please don't try to push through this alone if:
Your fever is above 101°F or you have shaking chills
Symptoms haven't started improving within 24 hours of home care
The redness is spreading or you notice a red streak moving away from the original area
You feel significantly unwell, confused, or unable to care for yourself or your baby
Mastitis can progress to a breast abscess if it isn't treated, and antibiotics are sometimes necessary. There's no badge of honor in toughing out a fever of 103. Reach out to your OB, midwife, or an IBCLC who can help you figure out next steps.
Recurring Mastitis Is a Sign for More Support, Not Bad Luck
If you're dealing with mastitis over and over, that's your body telling you something isn't fully resolved, whether it's a latch issue, an oversupply that hasn't been addressed, a bra that's too tight, or a feeding routine that isn't working for your body anymore. Recurring mastitis is one of the clearest signs that it's time to work with an IBCLC rather than white-knuckle through each flare on your own.
A Personal Note
I've had mastitis more than once across my own breastfeeding years, and every single time, the thing that helped most wasn't more pumping. It was rest, ice, and giving myself permission to slow down instead of powering through. If you're in the thick of it right now, I hope this gives you a clearer path forward and a little less fear about what's happening in your body.
If you're dealing with recurring mastitis, a stubborn clogged duct, or you're just not sure whether what you're feeling is normal, I'd love to help you sort it out.
Demi Lucas, IBCLC, PMH-C, Doula |Kindred Milk
Hello@KindredMilk.com | (703) 375-9705 | KindredMilk.com