Blocked Milk Duct or Mastitis? What Physiotherapy Can (and Can't) Do to Help

It's 2am, feeding has just started hurting on one side, and there's a hard, tender lump that wasn't there yesterday. Searching online at this hour rarely helps. The reassuring truth is that a blocked duct is one of the most common problems of breastfeeding, and it is usually temporary. What is worth knowing in advance is what separates a lump that will settle if you keep feeding from one that needs a doctor, and where physiotherapy genuinely fits in.

Blocked duct or mastitis: which one do I have?

Fever is the clearest dividing line: blocked ducts usually don't cause fever, while mastitis often does. Both can start as a sore lump, which is why they get confused. A blocked duct isn't an infection. It happens when milk doesn't drain fully and builds up into a temporary lump, and it is usually less painful than mastitis and comes without a fever.

	Blocked duct	Mastitis
What you feel	A painful, hard, lumpy area; milk may flow more slowly on that side	A painful, red, inflamed area, often wedge-shaped, sometimes with red streaks
Fever	Usually none	Can be over 38.5°C, with chills and body aches
Skin	Usually not red or inflamed	Red and inflamed
What to do	Keep feeding and look after it at home	See a doctor if the fever or pain keeps getting worse

The two are connected: a blocked duct that isn't dealt with promptly can turn into mastitis. That is the reason to act early, not to panic.

What should I do in the first day or two?

Keep feeding, stay gentle, and resist the urge to pump the breast empty. Stopping breastfeeding or expressing can make things worse, so carry on. What helps:

• Feed on demand, and vary your feeding positions so the breast drains well.
• Massage gently before and during a feed. Avoid deep, firm massage, which can bruise and damage the breast tissue.
• Hand express a little before latching, to help the milk flow.
• Don't pump to empty. Trying to empty the breast can push you into oversupply and make the swelling and inflammation worse. A little expressing after a feed for comfort is fine.
• Cold compresses between feeds or pumping sessions to ease swelling and pain.
• Loosen up. A tight bra or restrictive clothing can compress the breast and stop one area draining.

For pain relief or anything else taken by mouth, check with your doctor or pharmacist what suits you while breastfeeding.

If it still isn't clearing after several feeds, some expressing, and cold compresses, get help from a lactation consultant.

When should I see a doctor?

See a doctor if you have a fever, or if pain and redness are getting worse instead of better.

Worsening inflammation and pain with a fever that lasts more than 24 hours can mean an infection, and that needs medical care. It is not something to push through on your own, and it is not something physiotherapy replaces.

If you do need antibiotics, the ones usually prescribed for mastitis are safe to take while breastfeeding. Keep feeding unless your doctor tells you otherwise: stopping suddenly raises the risk of a breast abscess.

Can a physiotherapist help, and is ultrasound really proven?

A physiotherapist can help when self-care isn't clearing things.

Therapeutic ultrasound is one of the treatments a women's health physiotherapist can offer for blocked ducts. An international breastfeeding medicine protocol, revised in 2022, says it may be an effective treatment.

Ultrasound is a reasonable thing to try alongside the basics above. It is not a replacement for them, and not a replacement for a doctor if you have a fever. Most of the value of a session is everything around the machine: working out why the duct keeps blocking and changing that.

What happens at a physiotherapy session?

An assessment and a breastfeeding history come first, and treatment follows from what those find. At our clinic, a session for blocked ducts can include:

• An assessment to find the affected area
• A history of your breastfeeding, and what may have led to the blockage
• Ultrasound over the affected area, for around 10 minutes. It isn't painful; you may feel gentle warmth
• Advice on positioning and on reducing pressure on the ducts
• How to massage yourself gently at home

We may also refer you to, or work alongside, a lactation consultant, because a blocked duct is often a feeding problem as much as a breast problem.

Frequently Asked Questions

• Can I keep breastfeeding with a blocked duct or mastitis?
  Yes, and you should. Stopping suddenly can raise the risk of an abscess.
• Should I use heat or cold?
  Cold compresses between feeds for swelling and pain. Advice on warmth before feeds varies between sources, so if you're unsure, ask your lactation consultant rather than following whatever you read last.
• There's a small white spot on my nipple. Should I pop it?
  No. That is a milk blister (bleb). Don't burst it with a needle, which can damage the duct and narrow it further. Feeding often helps it clear; see a doctor or lactation consultant if it is painful.
• How many physiotherapy sessions will I need?
  Usually two to three, one to two days apart. Your physiotherapist will confirm after assessing you, and will tell you if you need a doctor instead.
• Do I need a doctor's referral to see a physiotherapist?
  No referral is needed to book with us. If you have a fever, see a doctor first.

Getting back to comfortable feeding

A blocked duct is common and usually temporary, and most clear with the unglamorous basics: keep feeding, be gentle, use cold between feeds, and don't over-pump. Physiotherapy is there for the ones that don't settle or keep coming back, as one part of the plan. And if there's a fever, the right first stop is a doctor.

If a blocked duct isn't clearing, or keeps coming back, book a women's health physiotherapy session for blocked ducts.

References

1. SingHealth HealthXchange. Breastfeeding: How to Prevent Mastitis and Blocked Ducts. https://www.healthxchange.sg/pregnancy/during-pregnancy/breastfeeding-prevent-mastitis-blocked-ducts (accessed 30 September 2026)
2. SingHealth HealthXchange. Breastfeeding: Tips to Treat Mastitis and Blocked Ducts. https://www.healthxchange.sg/pregnancy/during-pregnancy/breastfeeding-tips-treat-mastitis-blocked-ducts (accessed 30 September 2026)
3. Mitchell KB, Johnson HM, Rodríguez JM, et al. Academy of Breastfeeding Medicine Clinical Protocol #36: The Mastitis Spectrum, Revised 2022. Breastfeeding Medicine. 2022. https://doi.org/10.1089/bfm.2022.29207.kbm
4. Douglas P. Does the Academy of Breastfeeding Medicine's Clinical Protocol #36 'The Mastitis Spectrum' promote overtreatment and risk worsened outcomes for breastfeeding families? Commentary. International Breastfeeding Journal. 2023;18:51. https://pmc.ncbi.nlm.nih.gov/articles/PMC10481477/