If you have mastitis, pump only as often as your baby would normally feed, and only enough to relieve pressure. The old advice to pump as frequently as possible and “empty the breast” has been replaced by updated clinical guidelines that take the opposite approach: over-pumping actually makes mastitis worse.
Why the Advice Has Changed
For years, the standard recommendation was to pump aggressively and often to clear the blockage. The Academy of Breastfeeding Medicine revised its mastitis guidelines in 2022 and found that this approach “lacks physiological validity.” Frequent stimulation of already-congested breast tissue worsens swelling, increases pain and redness, and makes it harder for a baby to latch. Pumping too often also disrupts the natural balance of bacteria in breast milk, which can actually raise the risk of developing a bacterial infection on top of the inflammation you already have.
The core problem is a cycle: over-pumping signals your body to produce more milk, which increases tissue swelling, which traps more milk, which causes more pain. The updated guidelines are clear that “pumping to empty” perpetuates hyperlactation and is a major risk factor for worsening inflammation.
How Often and How Long to Pump
If you’re exclusively pumping, match the frequency and volume your baby actually consumes. That means keeping your normal pumping schedule rather than adding extra sessions. If your baby nurses on the affected side, continue feeding on demand but don’t try to drain the breast beyond what your baby naturally takes.
Keep sessions shorter than usual. Pump just long enough to soften the breast and relieve painful pressure, which may mean 10 minutes rather than your typical 20. The goal is comfort, not maximum output. If your baby is nursing well on the affected side, you may not need to pump at all.
What to Do Between Sessions
Current evidence recommends a combination sometimes called BAIT: breast rest, anti-inflammatory pain relief (like ibuprofen), ice, and acetaminophen. Apply ice or cold packs for 10 to 20 minutes every one to two hours while you’re awake. Cold reduces the swelling and inflammation that are driving your symptoms.
Heat is more nuanced than you might expect. A warm compress right before nursing or pumping can help milk flow more easily, but using heat throughout the day increases blood flow to already-swollen tissue and makes things worse. Use warmth sparingly and briefly, only right before a feeding if it feels soothing.
Gentle lymphatic drainage can also help move fluid away from the affected area. This isn’t the deep massage you may have seen recommended online. Instead, use very light, firm pressure with flat fingertips on the skin around your armpit and upper chest. The goal is to encourage fluid to drain through your lymph system, not to aggressively knead the breast tissue itself. Traditional deep massage of the inflamed area can cause more tissue damage.
What Not to Do
Avoid adding extra pumping sessions beyond your normal schedule. Don’t try to “power pump” through mastitis. Resist the urge to massage the painful area deeply or use tools like vibrating massagers to try to break up a clog. These approaches feel intuitive but work against you by increasing swelling, pain, and the inflammatory response.
Reducing stimulation to the affected breast may temporarily increase discomfort as your breast adjusts. This is expected. A natural protein called feedback inhibitor of lactation, along with other hormones, will activate and begin slowing milk production in that breast, which is what ultimately breaks the cycle and prevents future episodes.
Is the Milk Safe for Your Baby?
Yes. Breast milk from an inflamed or infected breast is safe for your baby. The composition changes slightly during mastitis, which can make the milk taste saltier, and some babies refuse the affected side because of this. If your baby won’t nurse on that side, pump just enough to stay comfortable and meet your baby’s feeding needs with the expressed milk or the other breast.
When Mastitis Gets More Serious
Most mastitis improves within a few days with reduced stimulation, ice, and anti-inflammatory medication. Around 3% of lactating women with mastitis develop a breast abscess, though some studies report rates up to 11%. Signs that mastitis is progressing rather than resolving include a fever that persists beyond 24 to 48 hours, a worsening area of redness that becomes very firm or develops a soft fluctuant center, or symptoms that don’t improve at all after several days of conservative management. Bacterial mastitis requires antibiotics, so worsening or persistent symptoms warrant a medical evaluation rather than more aggressive pumping.