Mastitis While Breastfeeding: What to Do

Clogged duct, inflammatory mastitis or infection?

Mastitis is now seen as a spectrum. Milk build-up causes swelling around the ducts and tissue. This narrows ducts further and causes inflammation. If it continues, bacteria can multiply.

Small white spots on the nipple (milk blebs) can also cause pinpoint pain. Do not pick or puncture them.

What to do in the first 24 hours

1. Feed from both breasts as you normally would. Do not try to "drain" the affected breast completely or add extra pumping sessions; this increases supply and inflammation.
2. Ice the area for 10 to 15 minutes between feeds. Cold reduces swelling better than heat.
3. Take ibuprofen at the label dose for pain and inflammation. Acetaminophen (paracetamol) can be added for pain. Both are safe while breastfeeding.
4. Use light touch only. Very gentle strokes from the nipple toward the armpit help drain lymphatic fluid. Avoid deep or painful massage, which can bruise tissue and worsen inflammation.
5. Support, not squeeze: wear a soft, supportive bra; avoid tight bras, underwire pressure and bag straps.
6. Rest and drink fluids. Ask for help with household tasks and night feeds where possible.

Some lactation specialists suggest sunflower or soy lecithin for recurrent clogged ducts; evidence is limited but it is considered low-risk.

When you need antibiotics

See a doctor, midwife or lactation-trained clinician if:

• you are not improving within 12 to 24 hours of home care
• you feel very unwell, with high fever and chills
• symptoms are getting worse quickly
• there is cracked nipple skin with signs of infection

Antibiotics compatible with breastfeeding, such as dicloxacillin or cephalexin (or clindamycin for penicillin allergy), are usually given for 10 to 14 days. Most people feel much better within 48 hours. If not, a milk culture and ultrasound are arranged to check for resistant bacteria or an abscess.

Probiotics have not been proven to treat mastitis.

Can I keep breastfeeding with mastitis?

Yes. Continuing to breastfeed is safe and helps recovery. Healthy, full-term babies are not harmed by the milk, even if bacteria are present. The affected breast may produce less milk or taste slightly saltier for a few days, and some babies are fussier; this is temporary.

If feeding from the affected side is too painful, express gently just enough for comfort, and feed from the other side. Stopping suddenly increases the risk of an abscess.

If you have a premature or unwell baby in a neonatal unit, ask the team about using milk from the affected side.

Breast abscess

About 3 to 11% of mastitis cases progress to an abscess. Signs are a firm, very tender lump that persists, sometimes with overlying shiny red or darker skin, and ongoing fever. An ultrasound confirms it. Treatment is drainage with a needle, sometimes repeated, plus antibiotics. Most people can continue breastfeeding, unless the drainage site is close to where the baby latches.

Preventing mastitis

• Get latch help early. For breastfeeding problems, a lactation consultant can fix shallow latch, nipple pain and positioning problems.
• Feed responsively. Follow your baby's cues rather than a strict schedule, and avoid long gaps.
• Avoid oversupply. Do not pump after every feed "to empty" unless advised for a specific reason.
• Avoid pressure from tight clothing, seat belts placed over the breast, and sleeping on your front.
• Wean gradually, dropping one feed every few days.
• Treat nipple damage promptly and watch for signs of thrush or bacterial infection.
• Rest and accept help, especially in the early weeks.

For an overview of mastitis types, including mastitis outside breastfeeding, see breast infection (mastitis).

Frequently asked questions

How do I treat mastitis at home?

Keep breastfeeding as usual, apply ice between feeds, take ibuprofen at the label dose, use only gentle light touch on the breast, wear a supportive non-tight bra and rest. If you are not getting better within 24 hours or feel very ill, contact a doctor for antibiotics.

Should I use heat or ice for mastitis?

Ice is now recommended. Cold reduces swelling and inflammation. Brief warmth just before a feed may help milk flow for some people, but prolonged heat can increase swelling. Avoid deep massage.

How long does mastitis last?

With early home care, mild mastitis often improves within 24 to 48 hours. With antibiotics, most people feel better within 2 to 3 days, and redness clears over a week or so. A lump that lasts longer needs checking for an abscess.

What is the difference between a clogged duct and mastitis?

A clogged duct is a tender, firm area without fever, and you feel well. Mastitis involves a larger inflamed area and often fever, chills and aches. They are part of the same spectrum, and the same gentle care helps both.

Can pumping too much cause mastitis?

Yes. Pumping after feeds or adding extra sessions can increase milk supply beyond what the baby needs, raising the risk of engorgement, inflammation and mastitis. Aim to match your baby's needs, and ask a lactation consultant for help with oversupply.