Blocked Milk Duct Won't Clear? How a Physio Can Help with Mastitis
By Physiotherapist, Kathryn Melvin
If you have a blocked milk duct that won't clear, or early signs of mastitis, a women's health physio can help. Physios treat blocked ducts and mastitis with gentle lymphatic drainage, therapeutic ultrasound, taping and practical feeding advice, often easing pain within one or two sessions. Many breastfeeding mums don't know this is an option, so they push through painful, hard lumps for days.
This guide explains what is happening in your breast, why the advice has changed in recent years, what you can do at home, and when you need to see your GP instead.
What is a blocked milk duct, and what is mastitis?
A "blocked duct" is now understood as swelling and inflammation in the breast tissue, rather than a plug of milk stuck in a tube. The swelling narrows the milk ducts, so milk can't flow freely from that area. You may notice a tender, firm or hard lump, a wedge-shaped red or darker patch, or pain when feeding.
Mastitis sits further along the same spectrum. The inflammation becomes more widespread and you may feel flu-like: hot, shivery, achy and exhausted. Sometimes a bacterial infection develops, which needs antibiotics from your GP.
Common signs include:
A painful lump or hard area in the breast
Redness, warmth or swelling over part of the breast
Pain or burning while feeding or pumping
Fever, chills or feeling generally unwell
It is common, especially in the first few months of breastfeeding, and it is not a sign you are doing anything wrong.
Why the old advice has changed
If your mum, friends or an online forum told you to use heat, massage the lump hard and feed as much as possible from that side, you're not alone. That was standard advice for years. Updated international guidance from the Academy of Breastfeeding Medicine (2022) now recommends a gentler approach, because the problem is inflammation.
Deep, firm massage can bruise the tissue and make swelling worse. Light, skin-level strokes towards the armpit are better.
Heat can increase swelling. Cold packs between feeds usually help more.
Feeding or pumping extra on the sore side can increase milk supply and keep the cycle going. Feeding your baby as normal is the goal.
Vibrating devices and pressing on the lump are no longer recommended. This shift is one reason seeing a physio early can help. We'll show you exactly what to do, and what to stop doing.
How a women's health physio can help with mastitis and blocked ducts
A physio appointment for a blocked duct or mastitis usually takes 30 to 45 minutes. You can bring your baby, and you're welcome to feed during or after the session.
Your physio may use:
Therapeutic ultrasound. A gentle, painless sound-wave treatment applied over the sore area to help reduce inflammation and swelling. Most people feel nothing more than warmth from the gel.
Lymphatic drainage. Very light, slow strokes that move excess fluid away from the breast towards the lymph nodes in your armpit.
Kinesiology taping. Stretchy tape applied to the skin to support fluid drainage between appointments.
Positioning and attachment checks. Small changes to feeding positions or pump flange size can reduce pressure on one area of the breast.
A home plan. Clear, simple steps for icing, gentle drainage and pain relief, plus warning signs to watch for.
Physio works alongside your GP, midwife, child and family health nurse or lactation consultant. If your symptoms point to an infection or abscess, we'll refer you on promptly.
What you can do at home
These steps are safe for most breastfeeding mums while you arrange an appointment:
1. Keep feeding your baby as you normally would. Your milk is safe for your baby, even with mastitis.
2. Use a cold pack wrapped in a cloth on the sore area for 10 to 15 minutes after feeds.
3. Use light, feather-touch strokes from the breast towards your armpit. No deep pressure on the lump.
4. Wear a supportive bra that isn't tight, and avoid underwire or tight straps pressing on the area.
5. Rest, drink to thirst and eat regularly.
6. Ask your pharmacist or GP about pain relief that is safe while breastfeeding.
Avoid pumping extra milk to "empty" the breast unless your health professional has advised it.
When to see your GP urgently
See your GP the same day, or go to an emergency department after hours, if you have:
A fever, chills or flu-like symptoms that aren't improving within 12 to 24 hours
Red streaks spreading across the breast
Pus or blood in your milk, or from the nipple
A lump that feels fluid-filled or keeps growing, which may be an abscess
Symptoms in both breasts, or you feel very unwell
If a lump doesn't settle after treatment, always have it checked by your GP. You can see your physio and GP at the same time.
Do I need a referral, and what does it cost?
You don't need a GP referral to see a physio in Australia. You can book directly. If you have private health insurance with extras cover, you can usually claim part of the fee on the spot.
Blocked ducts and mastitis are easier to settle when treated early, so we keep same-day or next-day appointments available for breastfeeding mums where we can.
Frequently asked questions
Can a physio treat mastitis?
Yes. Women's health physios treat the inflammation and swelling of mastitis with ultrasound, lymphatic drainage and taping. If you have signs of infection, you'll also need to see your GP, as physio does not replace antibiotics.
How do I clear a blocked milk duct fast?
Keep feeding as normal, use cold packs, try light strokes towards the armpit and avoid deep massage. If the lump hasn't eased within a day, a physio appointment can often speed things up.
Is therapeutic ultrasound safe while breastfeeding?
Yes. It is applied to the breast tissue and does not affect your milk or your baby. You can feed straight after treatment.
Should I massage a blocked duct?
Only gently. Firm massage can damage tissue and worsen swelling. Light, skin-level strokes are recommended instead.
Can I keep breastfeeding with mastitis?
Yes. Feeding as normal is safe for your baby and is part of recovery.
How many physio sessions will I need?
Many mums notice improvement after one or two sessions, but this varies from person to person.
Blocked ducts and mastitis are easier to settle when treated early, so we aim to see
breastfeeding mums as quickly as possible. Call us on (02) 8322 3898 to book.