Blocked milk ducts that keep coming back: why, and how to prevent it

After pumping, she squeezed until nothing was left, kneading the blocked side until the breast felt "soft and limp". Yet about 15 minutes later, the same spot was painful and blocked again. She told the doctor this when she was more than three weeks past giving birth and still had not broken out of the cycle of blocked milk ducts.

Her record begins on the seventh day after birth. She was nearly 30 and came in because her breasts felt very full and tight; her milk had come in at about 450 ml a day, and her baby was getting about 90% breast milk. Before that, she had a cesarean after about 17 hours of labor. During her few days in hospital the incision hurt and sitting up to breastfeed was hard, so the baby also needed some formula.

Nearly two weeks after birth she came back, this time for blocked ducts. The record notes: "lots of milk, frequent blocked ducts, often stressed, angry". The doctor diagnosed Liver constraint with qi stagnation (肝郁气滞 / 肝鬱氣滯, gān yù qì zhì; in traditional medicine, the qi of the Liver is pent up and held back), together with blood stagnation and dampness stagnation (blood and body fluids are not flowing well either), and prescribed herbs to soothe the Liver (疏肝, shū gān, helping Liver qi flow freely) and open up the milk flow.

At the visit just over three weeks after birth, she described in detail what she was doing. She pumped every 3 hours, for 20–30 minutes each time, then squeezed as described above. Breastfeeding the baby directly did not help either. She was also making her own drink of Ming aralia leaves with Dang shen (Codonopsis pilosula root) and drinking it in place of plain water. Her back pain had gone and the clammy, oily sweating had eased; only her breasts were still blocked.

The doctor wrote in her record that drinking a single qi tonic on its own like that risked making the qi rebel and become constrained (qi moving the wrong way and getting pent up), which can easily lead to blocked ducts. The doctor then treated the muscles on both sides of the upper back and worked out a new expressing rhythm with her: about once every 4 hours, never more than 6 hours between two sessions, and keeping one session at night.

The record stops there. The next time she came back was more than a year later, for something else, so we do not know whether she kept getting blocked ducts after that adjustment. Her case is worth telling because she had plenty of milk and still got blocked again and again. Reading the 2022 protocol of the Academy of Breastfeeding Medicine (ABM), we think some of the things she did with the best intentions may have helped keep the cycle coming back. That diligence came from real love for her baby. All that needed adjusting was the rhythm of removing milk and how hard her hands were working.

A hard, painful spot is not necessarily a lump of milk

Many people picture a blocked duct like a clogged pipe: a plug of thick milk sits in the way, and squeezing the plug out clears it. The 2022 ABM protocol suggests a broader view. Inside the breast there are a great many milk ducts woven together. As ABM interprets it, poor milk flow may be linked to a mismatch between how much milk is made and how much is removed, to ducts narrowed by swelling and inflammation in the tissue around them, or to several factors at once. So you should not assume that every hard, painful area is a clump of curdled milk stuck inside a duct. ABM also places blocked ducts, mastitis and breast abscess (a pocket of pus in the breast) on one spectrum, running from mild to severe.

If the area is inflamed, squeezing it more tends to make the swelling worse and injure the tissue, so hard squeezing usually does not help. Care therefore aims to calm the inflammation, avoid injuring the tissue further, and still remove milk regularly, in step with your baby’s needs and the amount of milk you are making.

Why it keeps coming back

Coming back is common. About 20% of mothers, or 1 in every 5, get mastitis in the first six months, and quite a few have more than one episode: of 219 mothers with mastitis, 63 had more than one (Kinlay 1998, following 1075 mothers in Australia). The World Health Organization (WHO) document on mastitis from 2000 also describes blocked ducts as "often recurring", and puts this partly down to breastfeeding technique that has not been corrected. In a later study (2001), Kinlay’s group also found that mothers with blocked ducts had about 2.4 times the risk of mastitis, and they regarded blocked ducts as a warning sign.

Plenty of milk, yet still pumping often

According to ABM 2022, oversupply is the main background that makes mothers prone to blocked ducts and mastitis. Feeding mostly on the painful side, or trying to "pump it empty", can, according to this protocol, keep the oversupply cycle going and make the inflammation worse. Mothers who felt they had too much milk had about 2.6 times the risk of mastitis, and mothers who expressed milk many times a day about 1.6 times (Cullinane 2015, 346 first-time mothers in Australia).

Not pumping until empty does not mean leaving your breasts overfull either. You still need to remove enough milk for your baby’s needs and for the amount you are making, and not let your breasts stay overfull for too long.

The protocol describes one case. A mother was told to pump every 2 hours to "keep the breast empty"; the milk on that side increased sharply and the mastitis kept returning. When she switched to feeding her baby on the less full side first, it did not come back. That is only an illustrative case, not research, but set beside the mother in our clinic it looks quite similar: she too pumped every 3 hours and then squeezed until nothing was left, even though her record already noted plenty of milk.

Squeezing until empty, massaging hard

ABM 2022 advises avoiding deep massage because, according to this protocol, vigorous massage can increase inflammation and swelling and damage small blood vessels. A small study that looked back over medical records points in the same direction: among 52 mothers treated by one surgeon, the group with a phlegmon (an area of inflamed, hardened tissue) reported deeper, harder massage than the other groups (Johnson and Mitchell 2020). Her record does not mention swelling on examination, so we cannot say for certain. But when kneading until the breast is "soft and limp" is followed by pain again 15 minutes later, that cycle is worth thinking about: hard kneading makes the inflamed area swell more, more swelling feels like another blockage, and so she kneads again.

The Chinese acupuncture textbook also advises against squeezing when milk is backed up and the breast is full and painful, so that it does not turn into "breast welling-abscess" (乳痈 / 乳癰, rǔ yōng; a swollen, inflamed breast that may form pus).

A bra pressing on the breast, sessions too far apart

Your bra should fit well and give support, as ABM advises. WHO 2000 mentions a tight bra as a mechanical factor, though the evidence is mostly case reports. Bag straps or baby carrier straps that press on one spot of the breast for a long time are also worth watching.

Pumping too often is not good, but leaving sessions too far apart is not right either. The doctor adjusted her rhythm along those lines, so that her breasts would not stay overfull for too long.

Stress and anger

Traditional medicine books say more about this than about anything else. Fu Qingzhu (傅青主) describes a mother who, after giving birth, meets with things not going her way: both breasts become full and painful, and the milk channels block. People usually put it down to fire in the Stomach (heat in the stomach, in traditional medicine terms). He calls it "Liver qi constrained and knotted" (肝气郁结 / 肝氣鬱結, gān qì yù jié): the milk is still there, it just does not flow, and once Liver qi flows freely, the milk flows on its own.

Zhang Zihe (张子和 / 張子和), in Rú Mén Shì Qīn (儒门事亲 / 儒門事親, Confucians’ Duties to Their Parents), which Xia Guicheng’s (夏桂成) gynecology work quotes, writes that crying, grief, anger and pent-up feelings leave "the milk vessels blocked" (乳脉不通 / 乳脈不通, rǔ mài bù tōng), and the book warns that after birth one must "above all avoid bottling things up". The classical Vietnamese physician Hai Thuong Lan Ong, following Zhu Danxi (朱丹溪), explains it through the channels, the pathways that qi runs along in the body according to traditional medicine: the breast belongs to the Stomach channel and the nipple to the Liver channel, so anger and pent-up sadness stop Liver qi from flowing freely and the milk backs up. These books also name rich, strongly flavored food as one cause. That is the traditional medicine view; ABM 2022 states that there is no evidence any particular food causes mastitis.

Her diagnosis of Liver constraint with qi stagnation sits within this view. Xia Guicheng’s book also points out that when Liver constraint comes from emotional troubles, herbs that soothe the Liver are not enough on their own; what weighs on the heart has to be eased.

Modern medicine is more cautious. WHO 2000 notes that stress and fatigue are often mentioned, but there is little firm evidence. When 22 mothers were put under stress with mental arithmetic and noise, the number of oxytocin pulses (oxytocin is the hormone that pushes milk out) during suckling dropped, meaning the milk came down less easily, even though prolactin (the hormone that makes milk) and milk volume did not change (Ueda 1994). Anxiety and depression late in pregnancy, and postpartum depression, also go along with a higher risk of mastitis (Dagla 2021, 622 Greek women). No study has proven that anger blocks milk; what has been seen is only that when a mother is stressed, her milk comes down more slowly.

Taking extra milk boosters when there is already enough milk

Folk tradition and some books on Vietnamese folk remedies say Ming aralia leaves increase milk. We searched PubMed (the US database of medical research) on October 13, 2026, and found no study on Ming aralia (Polyscias fruticosa) and breast milk, in humans or in animals; there is only one study in rats on a related species, P. scutellaria. The ABM protocol on galactogogues (substances that increase milk supply) does not recommend any specific one, and only discusses milk boosters for mothers with low supply.

Whether taking milk boosters when you already have too much milk causes more blockages has not been measured directly either. The "should not" here is our own inference, because oversupply is a risk factor and milk boosters aim to make more milk. Traditional medicine puts it in its own way. Xia Guicheng’s book distinguishes: "soft breasts with clear, thin milk belong to deficiency; full, painful breasts with fairly thick milk belong to excess", and then "for deficiency, tonify and unblock; for excess, transform and unblock" (deficiency means the body is lacking or weak; excess means something is backed up or in surplus). The Chinese materia medica textbook warns that using tonics for an excess condition can easily "tonify wrongly and make the illness worse", so tonics should be paired with herbs that move qi (help qi flow), so that they tonify without causing stagnation.

Traditional medicine classes Dang shen as a tonic for both qi and blood, and it appears in many postpartum formulas. What the doctor disagreed with was the way she used it: drinking a single tonic on her own all day in place of water, when she already had too much milk and her qi was constrained, with no one examining and monitoring her.

Old advice that has changed

The old books once advised the opposite. Hai Thuong (following Danxi) said that at the start one should "bear the pain and knead the breast until soft, and suck the milk out"; Xia Guicheng’s book advises "emptying the breast"; and both WHO 2000 and ABM 2014 once recommended warm compresses, feeding, expressing more often and massaging the lump. The 2022 ABM protocol has dropped that advice.

Preventing it from coming back

The steps below come mainly from ABM 2022, and most are level C recommendations, meaning expert opinion, not the results of large trials.

• Feed your baby on demand, without trying to feed or pump until the breast is empty;
• Still remove enough milk for your baby’s needs and the amount you are making, and don’t let your breasts stay overfull for too long;
• If you use a pump, pump only as much as your baby drinks;
• Keep your pumping rhythm close to your baby’s feeding rhythm;
• Change the rhythm gradually, with someone monitoring;
• When you touch your breast, only stroke the skin very lightly;
• Don’t squeeze or knead a spot that hurts;
• If your breasts feel full, use a cold compress after feeds;
• Wear a well-fitting, supportive bra;
• When your baby sleeps, catch up on sleep yourself;
• Ask family members to take over some of the housework;
• Set aside a little time each day to relax;
• Only take milk boosters when someone who has examined you says you need them;
• Don’t prick or poke a white spot on your nipple yourself.

Adjusting the pumping rhythm needs a closer look. The 2022 ABM protocol has also been criticized: Douglas (2023) argues that the advice to remove milk less often rests on an explanation that has not been proven, and that for mothers who do not truly have oversupply, cutting back can make the inflammation worse and reduce the milk. So don’t cut sessions on your own. A new rhythm should be set and monitored by someone who has examined you, together with you, as the doctor did with the mother above.

As for relaxation, a trial of 64 first-time mothers (Mohd Shukri 2019) found that practicing relaxation while breastfeeding helped mothers feel less stressed. The sample was small, but practicing costs nothing.

As soon as you notice a full, painful spot

At that point, keep feeding your baby on demand as usual, hand express a little if the fullness is uncomfortable, use cold compresses (possibly once an hour) and rest; these are the steps ABM 2022 sets out. Warm compresses can make the swelling worse, although some mothers find them soothing. Cold cabbage leaves work no better than a cold pack, since their effect comes mainly from the cold, and cabbage can carry Listeria bacteria. With this kind of care, many episodes of inflammation settle on their own; in a Swedish trial (Kvist 2007), only 15% of mothers needed antibiotics.

If you take any medicine while breastfeeding, including painkillers or traditional herbal medicine, tell the person prescribing it clearly. Medicines while breastfeeding will be covered in a separate article.

When you need to see a doctor

If you have a fever, chills, or feel achy and tired as if you have the flu, if the redness is spreading, or if you have done everything right and are not better after about 12–24 hours, see a doctor to check whether you need antibiotics. The 12–24 hour mark appears in the WHO 2000 document and in ABM 2014; ABM 2022 states that a fever or a fast heart rate lasting more than 24 hours needs to be assessed by a health professional. You can keep breastfeeding while taking antibiotics; milk from the inflamed breast does not harm your baby.

About 3% of mothers with mastitis went on to develop an abscess in a study of 1193 first-time mothers (Amir 2004); ABM 2022 gives 3–11%. A hard, red, painful area in one place that persists despite proper care should raise suspicion of an abscess and needs an ultrasound.

If the blockage keeps coming back in exactly the same spot (ABM 2014 gives a threshold of more than two or three times), see a doctor for an ultrasound to rule out an underlying lump. Redness that keeps increasing, skin that looks dimpled like orange peel, or a nipple or skin that is pulled inward means you need a breast check right away. Danger signs after birth are covered in our article "Warning signs after birth that need care right away".

When the pain and worry drag on

After a few repeat blockages, many mothers start living by the pump clock: at every session they feel their breasts for lumps, and even lying down they are thinking about the next session. If you find it hard to focus on anything else, become forgetful, sleep fitfully for fear of another blockage, or feel low or anxious for a long time, tell your doctor about it as you would any other symptom, because anxiety and postpartum depression go along with a higher risk of mastitis.

The doctor examines that worry as a symptom too. The tool is Applied Kinesiology (AK), which means testing muscle strength by hand: you think about your fear of getting blocked again, and the doctor tests a muscle to see how far the stress is reaching into the brain areas linked to emotion, namely the frontal lobe, the limbic system and the cingulate gyrus. Walther’s AK text notes that when a person focuses on a heavy emotional experience, muscles often weaken (Walther 1981, p. 26). If the muscle weakens with that thought, the doctor lightly places fingertips on the two frontal eminences of your forehead while you keep thinking about it, then retests the muscle until it holds firm; this is the emotional reflex point on the frontal eminences described in AK texts (Walther 2000, p. 433–434; Garten 2016, p. 23). You do not have to tell everything that is weighing on you. This approach aims at exactly what Xia Guicheng’s book advises, easing what weighs on the heart, alongside adjusting the feeding and pumping rhythm. AK adds a layer of assessment; it does not replace a medical diagnosis.

At the clinic

The clinic offers acupuncture for mothers with blocked ducts who do not have a fever, further assessment with muscle strength testing (Applied Kinesiology), and a review of feeding and pumping rhythm together with you. The Chinese acupuncture textbook notes that acupuncture "has a certain effect" on early breast welling-abscess, before pus forms; commonly used points include Jianjing, Danzhong, Rugen and Zusanli, adding Taichong for the Liver constraint pattern. Modern evidence is still limited. In the same Swedish trial mentioned above (205 mothers, with no blinding of who received acupuncture and who did not), the acupuncture group had less pain, redness and fullness sooner, on days 3 and 4, but the number of days of care needed and the number of mothers needing antibiotics did not differ from the group without acupuncture. Acupuncture may help mothers feel less pain sooner, but faster recovery has not been proven.

The clinic does not treat mastitis once there is a fever. At that point a mother needs to be seen early at an obstetric clinic or a hospital to check whether antibiotics are needed.

Her every-three-hours clock was a very steadfast kind of love. It only needed resetting to match how much her baby feeds and how much milk she herself makes, with gentler hands so the inflamed area had a chance to settle. If you have a full, painful spot that keeps coming back and no fever, we invite you to bring your feeding and pumping log to the clinic. We will go through each session together, and use acupuncture if appropriate so you may feel less pain sooner.

References

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