Pain While Pumping: What Helps?

Your nipples are more sensitive in the first weeks after birth than ever before, and a pump is something completely new for them. Many moms notice an unfamiliar pulling feeling when the suction starts, or mild soreness in the first few days, whether they’re nursing or pumping. Some also feel their let-down reflex very clearly: as tingling, or as a sudden feeling of fullness that can briefly hurt.

For nursing, researchers have looked closely at how long this early phase lasts. One major review found that for most women, nipple pain was only mild by about 7 to 10 days after birth, no matter how it was treated. We don’t have the same numbers for exclusive pumping. But an international physician society for breastfeeding medicine draws a clear line: pain that lasts longer than two weeks counts as persistent and needs a careful search for the cause.

You do not need to wait two weeks, though. Take a closer look if …

• it hurts for the whole session, not just the first moments,

• the pain gets worse day by day instead of better,

• your nipple is white, purple, or clearly swollen after pumping,

• it cracks, bleeds, or bruises,

• you’re already dreading every session before it starts.

Pain is not just unpleasant. It can also slow your milk flow: stress and pain reduce the hormone oxytocin, which triggers the let-down reflex. So if you’re pumping through clenched teeth, you’re usually making it harder for your body, not easier.

And if you’re wondering whether you’re just unusually sensitive: in a U.S. survey, just under 15 percent of 1,844 mothers reported injuries from a breast pump. So you’re not alone. And sometimes small changes to the flange and suction make a big difference.

The flange, also called the funnel or breast shield, is the part that sits on your breast. Your nipple is pulled into its narrow tunnel and released again with every cycle, over and over for the whole session. If that tunnel doesn’t fit, it rubs or presses exactly where your skin is most sensitive.

Often, people simply use whatever flange came in the box. But flanges come in many sizes for a reason: nipples vary a lot. Your two sides can even be different sizes, and size can change over the course of breastfeeding. A flange that fit six weeks ago may be too small or too large today.

Too small is the flange if …

• your nipple rubs on the tunnel wall instead of gliding freely back and forth,

• a pale ring forms at the base or the nipple turns purple,

• it’s sore afterward, or has blisters or cracks,

• only a little milk comes out even though you’re pumping.

Too large is the flange if …

• a lot of the darker areola is pulled into the tunnel,

• you feel pulling or pain at the base of the nipple,

• milk leaks out underneath or the flange doesn’t seal well,

• your nipple and areola are swollen after pumping or a red, sore ring is left behind.

A badly fitting flange is more than a comfort issue. An international breastfeeding medicine society lists the wrong flange size, suction that’s too high, and sessions that are too long among the reasons a pump can injure the nipple and breast tissue. And cracked nipples can become inflamed.

There is no scientifically proven formula for the perfect flange. But there is a good way to find a starting size, and then the real test is how it works on your breast. You’ll need a ruler with millimeter markings or a measuring tape. Some manufacturers also offer printable sizing guides.

1. 1

   Pick the right moment: Don’t measure right after pumping or nursing, when the nipple is stretched and often slightly swollen. Before measuring, gently roll it between two fingers until it stands out.

2. 2

   Measure only the nipple: The darker areola around it does not count.

3. 3

   Measure at the widest point: Usually that’s the base, where the nipple meets the areola. Hold the ruler across it and read the diameter in millimeters.

4. 4

   Measure both sides: Write both numbers down. Left and right can be different sizes.

5. 5

   Set a starting size: A common rule of thumb is the diameter at the base plus 2 to 4 millimeters. Some experts measure at the tip of the nipple instead and use that same size or 1 to 2 millimeters more, as recommended by an Australian breastfeeding organization. Both methods only give you a starting point. In a small 2025 study, mothers pumped more comfortably and, on average, expressed slightly more milk with smaller, individually fitted flanges than with the usual size. If you’re between sizes, try both.

6. 6

   Test it on the pump: Center the flange and start with the lowest suction. Look through the clear tunnel: your nipple should stay centered, glide back and forth easily with each pull, and not rub anywhere. The areola should mostly stay outside.

7. 7

   Check after the session: If your nipple looks the same as before — not discolored, not obviously swollen, with no cracks — the size fits.

8. 8

   Measure again: at the latest when the pain comes back. Nipples change during breastfeeding, and your flange may need to change with them.

Different flange sizes are available as accessories for most pumps, for example online or from the pump manufacturer. If you got your pump through your health plan or rented it, ask the supplier about other sizes and get advice on the settings.

Many people turn the suction up because they think more power means more milk. That’s only true up to a point. In an Australian study, mothers pumped at their “highest comfortable” suction — the strongest level that still felt okay. Milk flowed faster, and they got more milk than at weaker settings. Going beyond comfortable does not help more: suction that’s too strong is one of the common causes of sore nipples, and pain slows the let-down reflex.

Here’s how to find your setting:

1. 1

   Start every session with the lowest suction. Turning it all the way up right away can hurt and injure the nipple.

2. 2

   Wait until milk starts to flow. That can take a minute or two.

3. 3

   Then increase the setting step by step until it starts to feel uncomfortable.

4. 4

   Go back down one level. That’s your suction for today.

5. 5

   Find it again at every session. On sensitive days it may be lower, and that’s okay.

Two things can help gentler suction work better for you. First: use your hands too. If you gently press on your breast with the flat of your hand while pumping, more milk may flow. Gently means no kneading and no pain. Second: pump both sides at the same time if your pump can do that. In one study of 31 mothers, this triggered more letdowns than pumping left and right one after the other, and yielded more milk that was even slightly higher in fat. It also made the session shorter overall.

Relaxation is often underrated. A few minutes of warmth first, a warm drink, a photo or video of your baby, a worn onesie to smell: all of that can help your body release milk, even with less suction.

Most pumping sessions last 15 to 20 minutes, or until the milk has slowed to drops. It can be worth pumping a few minutes longer, because sometimes another let-down happens. But more than 30 minutes is too long for most women, according to an Australian breastfeeding organization. If you regularly stay on the pump for 40 or 50 minutes trying to catch the very last drop, your nipples pay the price.

More important than length is regularity: how often you remove milk usually matters more than how long. If you’re exclusively pumping, 8 to 12 sessions in 24 hours are common in the first weeks, about every 2 to 3 hours during the day and at least one session at night or early in the morning. During this time, no break should last longer than about 4 hours. At night, put your baby on their back in their sleep sack in their own crib, with no pillow, blanket, or bumper, and pump only then. Don’t pump with your baby in your arms on the couch or in an armchair, where you could both fall asleep. Once your milk supply has settled in, after about 3 months, many people manage with 5 to 6 sessions, as long as the amount stays stable.

This is directly related to pain. Long gaps let the breast get overly full, and an overly full breast feels hard, tight, and painful. On the other hand, too much pumping also causes problems: if you add extra sessions to get the breast “completely empty,” you’re telling your body to make even more milk. The breast stays overfull, the tissue swells, and the risk of clogging and inflammation goes up.

A simple rule of thumb once your milk supply is established, or if you’re pumping in addition to breastfeeding: pump about as often and as much as your baby would feed. This doesn’t apply during the build-up phase, especially not with a preterm or sick baby. Then the goal is to build your full daily supply, even if your baby is only getting a little right now. A common target is at least about 17 fl oz (500 ml) in 24 hours by the end of the second week, and ideally around 25 fl oz (750 ml). If your baby is in the hospital, ask the team what your target is. If you want to build a small stash alongside breastfeeding, morning is often best because your breasts are usually fullest after the night.

Even with the right flange, skin can still rebel, especially in the first weeks or if you pump a lot. The good news: sore nipples usually heal once the cause is fixed. Until then, a few simple things help:

• Breast milk instead of cream: After pumping, spread a few drops of milk on the nipple and let it air-dry. In studies, that helped at least as well as lanolin. Exceptions: If your nipple turns white after pumping, cover it with warmth right away instead of letting it air-dry. With thrush, the priority is keeping it dry.

• Use lanolin only if it helps you: You can apply a thin layer. But according to a major review, it does not work better than breast milk or even doing nothing, and in rare cases it causes a contact allergy. If the skin turns red and itchy underneath it, stop using it.

• Don’t scrub: Don’t wash your nipples separately with soap or disinfect them. That softens the skin and irritates it even more. Your normal shower is enough.

• Keep things dry: Change damp nursing pads right away, and ideally use ones without a plastic layer. Wear a well-fitting bra without underwire.

• Avoid irritants: Creams, nursing pads, detergent, or fragrances can cause eczema. If the skin is red, flaky, weepy, or itchy, think of that too.

• Use milk collectors sparingly: Silicone collectors that stay attached to the breast by suction can irritate nipples even more if used often.

What about nipple shields or breast shells? Nipple shields are a tool for latching at the breast; they do not help with pain while pumping. Public health services and an international breastfeeding medicine society advise against using them without a good reason when nursing. For breast shells and silver cups that are meant to keep fabric off sore nipples, it is unclear whether they speed healing. If you use them anyway, make sure moisture does not get trapped underneath.

While the nipples are open or cracked, you can adjust your routine: turn the suction down, recheck the fit, and pump for less time. If every pull hurts, hand expression is often the gentlest way to remove milk. If the pain is severe, you can set the pump aside for 12 to 24 hours and hand express regularly during that time so your supply doesn’t drop and your breasts don’t become overly full.

If open areas still are not healing after a few days, if they are weeping, or if yellow crusts form, have them checked by a doctor. Cracked nipples can become inflamed.

Your hands are the gentlest pump you have, and they work anywhere. In the first days after birth, they often remove the thick colostrum even better than a machine. Here’s how:

1. 1

   Wash your hands thoroughly and have a clean container with a wide opening ready.

2. 2

   Warm the breast for a few minutes with a warm washcloth. Then use a flat hand to stroke in long, light motions from the armpit toward the nipple, without pressing deeply.

3. 3

   Support the breast from underneath with one hand. With the other, make a C shape with your thumb and index finger about 1 inch (a few centimeters) away from the nipple, just outside the darker areola.

4. 4

   Gently press thumb and finger together, release, and repeat in a calm rhythm. Your fingers stay in place and do not slide over the skin.

5. 5

   Be patient if only drops come at first. Keep the rhythm going.

6. 6

   When the flow slows down, move your fingers a little farther around the breast and start again there. Then switch sides.

Hand expression should not hurt. Do not pull on the nipple or squeeze it; the pressure happens farther back, at the edge of the areola. It may feel awkward at first, but after a few tries most people get the hang of it.

A tried-and-true pair: a few minutes of warmth before pumping, for example a warm washcloth on the breast or pumping right after a shower. It relaxes things and helps many people get milk flowing more easily. If the breast feels tender or swollen afterward, cold helps reduce swelling and pain, right after pumping and between sessions: an ice pack or a cold, damp washcloth for about 10 minutes at a time. Always wrap ice packs in a thin cloth so the cold doesn’t touch your skin directly. Cabbage leaves or the cool quark compresses common in Germany (quark is a soft fresh cheese) are also options if you like; what mainly helps is the cold. In studies, cabbage leaves were no better than ice.

There are two exceptions to know:

• A hot, red, swollen area: Use cold here, and keep warmth brief or skip it. Heat widens blood vessels and can make swelling worse. An international breastfeeding medicine society specifically recommends cooling when there are signs of inflammation, even hourly if needed.

• A white, burning nipple after pumping: That points to a blood-vessel spasm, called vasospasm (more on that below). Then the opposite helps: dry warmth right away, and avoid cold.

You can also take something for the pain. Medication safety experts consider ibuprofen and acetaminophen the first-choice pain relievers while breastfeeding. Only very small amounts pass into milk. Ibuprofen also helps with inflammation and swelling. Follow the dosing directions on the package, and ask a pharmacist if you’re unsure or take other medications.

Suddenly one area of your breast feels tight. You can feel a hard, tender spot, and the skin over it may be a little warm or red. With a clogged duct, the symptoms stay limited to the breast: your temperature does not rise above 101.1 °F (38.4 °C), and you do not feel truly sick.

Despite the name, there usually isn’t a plug in a single milk duct that needs to be forced out. Based on what we know now, the tiny ducts are narrowed by irritated, swollen tissue. That’s why recommendations have changed in recent years. You may still hear: massage hard, take a hot shower, pump as often as possible until empty. Experts now recommend something different:

• Keep pumping on your usual schedule. Don’t stop suddenly; that can make symptoms worse. But also don’t add extra sessions or pump to the last drop: removing more milk means making more milk, which means even more pressure in the tissue.

• Use cold, after pumping and in between, even hourly for a few minutes if needed.

• Ibuprofen for pain and inflammation, if you can take it.

• No firm massage. Strong kneading or squeezing of the spot — especially with massage tools or electric toothbrushes — injures the tissue and makes inflammation worse. What is okay is very light stroking over the skin and gentle pressure with a flat hand while pumping.

• Let it breathe. No tight bra and no constricting clothing. A well-fitting, supportive bra is ideal.

• Rest. Lie down and let someone else handle household tasks and the baby where possible. That isn’t laziness; it’s part of treatment.

With measures like these, inflammation often settles without further treatment. If you are not better after 24 hours, if you get worse in between, or if fever appears, get examined by a doctor. A lump that is still there after three days should also be checked so an abscess can be ruled out.

Good to know: While breastfeeding, a breast often feels lumpy even without a clog. Glandular tissue just isn’t smooth. So lumpy doesn’t automatically mean a clogged area. What matters is whether one spot is hard, painful, and red or is getting bigger—and whether a lump sticks around. If you can still feel a firm spot after 3 days, have a doctor check it, even if it doesn’t hurt. Usually an ultrasound is enough, and that’s no problem while breastfeeding.

The best prevention is fairly even spacing between sessions, a well-fitting flange, appropriate suction, and loose clothing. If your day gets thrown off, for example because of work, it’s better to shift a session a little than to skip it completely.

If the area gets larger, redder, and hotter, and you feel sick, experts call it mastitis, or breast inflammation. Typical signs are strong pain, a swollen, red, warm breast, and flu-like symptoms: exhaustion, headache, body aches, chills, and a fever over 101.1 °F (38.4 °C). On darker skin, redness can be hard to see. In that case, pay extra attention to warmth, swelling, and pain.

Check with a thermometer if you suspect it. In the first weeks after birth, hormones make many women sweat, and hot flashes can easily feel like a fever. On the other hand, real fever in the first weeks can also have other causes, such as inflammation of the uterus, a C-section wound infection, or a urinary tract infection. So always mention at the appointment that you gave birth recently.

If you have a fever and feel sick, get medical help promptly: from your OB-GYN or midwife or your primary care doctor—after hours, through their after-hours line or at urgent care. Depending on the findings, you may be given an antibiotic. Several antibiotics are compatible with breastfeeding and pumping, so you do not need to wean because of that. Take it exactly for as long as prescribed. If there is no improvement after about 48 hours, contact them again.

Most importantly: your milk won’t harm your baby, even with bacterial mastitis. You can keep feeding it, and continuing to pump on your usual schedule helps your breast too. This applies to healthy, full-term babies. If your baby is in the NICU or a pediatric unit, let the team know before they get the milk, for example if there is pus in the milk or if you’re taking an antibiotic. While you’re on the antibiotic, your baby may have looser stools or develop thrush. Mention that at your pediatrician’s office, but don’t stop the antibiotic on your own. Mastitis also has nothing to do with poor hygiene, and it isn’t contagious.

Rarely, mastitis leads to an abscess, a pocket of pus that has become walled off. According to an international breastfeeding medicine society, this affects about 3 to 11 percent of women with acute mastitis. Clues include an area that becomes increasingly hard and red with a tense swelling underneath, or a fever that goes away at first and then comes back. An abscess needs medical drainage, usually with a needle or a small incision. In most cases, you can still keep nursing or pumping.

You take off the flange, and your nipple is snowy white. A moment later it burns, throbs, or stings, and often turns bluish or purple first and then red as the blood flows back. That’s vasospasm: the tiny blood vessels clamp down in a spasm. Typical triggers are cold and temperature changes, such as right after pumping, when you step out of a warm shower, in the freezer aisle at the grocery store, or in a strongly air-conditioned room.

It is especially common in women who already get cold hands and feet easily or who have Raynaud syndrome. Raynaud’s is common: it affects up to 1 in 5 women of childbearing age. An injured nipple, for example from a flange that is too small, can also make vasospasm more likely.

What helps:

• Cover the nipple as soon as you remove the flange and warm it with dry heat, such as a warmed cloth or a warm—not hot—hot water bottle in a cover that you don’t press on firmly. Skin with poor blood flow burns more easily.

• Pump in a warm room, keep your upper body and feet warm, and keep cold away from the breast, including ice packs and drafts from the air conditioning.

• Check the flange fit. Rubbing and pressure add more damage to the nipple.

• Avoid nicotine in any form, including from e-cigarettes or snus, because it narrows the blood vessels. If you want to quit using patches or gum, talk it over with a doctor. Being smoke-free also lowers the risk of sudden infant death syndrome.

If that doesn’t help, bring it up with your OB-GYN or primary care office. There are medications that widen blood vessels and can also be used while breastfeeding. Because vasospasm is often mistaken for thrush, a careful description helps: say that the nipple turns white first and that cold triggers the pain.

Burning, stabbing pain that continues after pumping or radiates deep into the breast makes many people think of yeast. And in fact, a yeast infection — usually Candida — can affect the nipples. Typical signs are a pink, shiny, or flaky nipple, itching, and pain that seems worse than the skin looks.

White patches in your baby’s mouth, a stubborn diaper rash, or an antibiotic you or your baby took recently also point toward thrush. Still, be careful with a quick yeast diagnosis: experts do not fully agree on how often Candida is really behind this kind of pain. A poorly fitting flange, suction that’s too strong, or vasospasm can feel very similar.

Have a doctor make the diagnosis—for you at your OB-GYN or primary care practice, and for your baby at the pediatrician’s office. If it is thrush, both of you need treatment at the same time, usually with an ointment for your nipples and a gel or suspension for your baby’s mouth, even if only one of you has symptoms. Otherwise you can keep passing the yeast back and forth. Don’t put oral gel in your baby’s mouth on your own: in Germany, for example, some miconazole gels are only approved from 4 months because of the choking risk. By the way, milk residue in the mouth can be wiped away with a clean, damp cloth; thrush patches cannot. Clean the pump parts especially thoroughly after every session during this time, and ask your doctor whether extra boiling is advisable.

• Milk blister: A small pale dot or blister right on the nipple that stings while pumping. Do not pop it with a needle. That injures the skin and can worsen the inflammation underneath. If it doesn’t go away on its own, a doctor can prescribe an anti-inflammatory cream that is compatible with breastfeeding.

• Eczema: Red, flaky, itchy, or weeping skin on the nipple and areola can be a reaction to creams, nursing pads, detergent, or fragrances. Stop using anything new. Eczema that affects only one side and does not heal over weeks should always be examined by a doctor.

• Overfull breasts: If your breasts make more milk than is needed, they may ache dully or sting sharply once they get very full, and they often leak. Extra pumping makes it worse because it tells your body to make even more milk. In that case, pump only instead of a feeding or when your breasts feel uncomfortably full before sleep — and only until you get relief.

But if the pain is deep inside the breast and you can’t see anything on the outside, and none of this fits, bring that up with a doctor too. That can have treatable causes as well.

If you’re not sure where the pain is coming from, keep notes for two or three days. It sounds like extra work, but it’s often the fastest way to find the cause. For each session, note:

• the time and how long it had been since the last session,

• the side, flange size, and suction level,

• how long you pumped and how much milk came out,

• when it hurt — when suction started, the whole time, or only afterward — and how badly, on a scale from 0 to 10,

• what the nipple looked like afterward: normal, white, purple, swollen, or sore.

A pattern often shows up quickly. Does only the left side hurt even though you use the same flange on both sides? Is it worse after long gaps? Does it burn mostly when you’re cold? A note next to the pump is enough for this. But you can also log every session in Moonsleep with the amount and side, and note the flange size and pain level in the comments. If you end up at an appointment later, you can simply show the pattern instead of trying to reconstruct it from memory.

When it hurts, it’s tempting to just stop. But stopping pumping all at once can make the breasts overly full and increase the risk of clogging and inflammation. Better: look for the cause, adjust your routine, and if needed, hand express for a while. If you want to stop completely, reduce sessions gradually.

You can get help even without a midwife. Your OB-GYN or primary care doctor can assess and treat inflammation, thrush, and vasospasm. At the pharmacy, you can get pain relief that’s compatible with breastfeeding. And in the US, your health insurance has to cover a breast pump, so ask your plan which one and when you can get it (more on that in the questions below).

If you can reach a lactation consultant (your health plan may cover it) or a volunteer breastfeeding counselor, for example from La Leche League, have them watch you pump. A second pair of eyes often spots right away whether the flange is sitting correctly. And if nobody is available: the steps in this article can still take you a long way on your own.

And if you notice that pumping is affecting your mental health a lot, that you dread every session, or that you’ve felt low for days, bring that up at the office too. That is just as much a part of treatment as the sore nipple.

And one last thing, because it’s easy to lose sight of between the pump, the bottles, and the clock: you are doing a lot for your child right now, often many times a day and at night. It’s okay for that to be tiring. It does not have to hurt. Pumping without pain is not a luxury — it’s the goal.