Why Pumping Hurts Sometimes and What to Do

A pumping session should not feel like something you have to grit your teeth through. If you are wondering why pumping hurts sometimes, you are not being dramatic, and you do not need to simply put up with it. A little pulling at the start can be normal. Pinching, burning, rubbing, cracking or pain that makes you dread switching the pump on is your body asking for a closer look.

The good news: many causes are fixable with a few small adjustments. And because postpartum life is already full enough, the goal is not perfection. It is getting your pump setup working with your body, so you can express milk with more comfort and more freedom.

Why pumping hurts sometimes: the most common reasons

Your flange size is not quite right

The flange is the funnel-shaped part that sits around your nipple. It is one of the biggest comfort factors in pumping, yet it is also easy to overlook. A flange that is too small can squeeze the nipple, cause rubbing and leave you sore afterwards. One that is too large may pull too much areola into the tunnel, creating friction and swelling.

During pumping, your nipple should move freely in the tunnel without scraping the sides. A small amount of areola may be drawn in, but it should not feel as though your whole breast is being tugged inside. Your nipples can also change size during pregnancy, in the early weeks after birth and even between feeds, so the size that worked last month may not be your best fit now.

If pumping leaves a white ring around the nipple, blisters, swelling or deep indentations, pause and reassess your fit. Measuring your nipple after a feed or pumping session can give you a more useful starting point than guessing based on breast size. Breasts are brilliant, but they do not follow a standard sizing chart.

The suction is higher than you need

More suction does not automatically mean more milk. In fact, turning the setting up too high can make your body tense, irritate your nipples and sometimes make let-down harder to trigger. The most effective setting is usually the highest level that still feels comfortable, not the level that feels most intense.

Start low, especially if you are tender or newly pumping. Use stimulation mode first if your pump has one, then increase gradually only until you feel a firm but pain-free pull. If you find yourself holding your breath, curling your toes or counting down until it ends, turn it down. That is not a badge of pumping honour. Comfort matters.

Your nipples are already sore or damaged

Pumping can feel painful because the skin is healing from something else, such as a shallow latch, frequent feeding, friction from damp breast pads or a previous flange mismatch. Even a correctly fitted pump can sting if there is a crack, blister or raw patch.

Keep the area clean and dry, change breast pads when they are wet, and consider a breastfeeding-safe nipple balm to reduce friction. A tiny amount around the flange tunnel can also help the nipple glide more comfortably, as long as it is compatible with your pump and your feeding plan. Soft, breathable pads can be a kindness when leaking makes everything feel extra sensitive.

If you have open cracks, bleeding that keeps happening or pain that is worsening rather than settling, get individual advice from your midwife, health visitor, GP or an infant feeding specialist.

Your pump parts need attention

Tiny pump components do a lot of heavy lifting. Valves, diaphragms and seals that are worn, stretched, split or not sitting properly can affect suction. That can lead to an uneven pulling sensation, longer sessions and the temptation to turn the power up higher than is comfortable.

Check that every part is clean, fully dry and assembled according to the instructions. Replace parts at the recommended intervals, particularly if your usual setting suddenly feels different or milk output drops without an obvious reason. With wearable pumps, make sure the collection cup is positioned securely in your bra too. A bra that is very tight can shift the pump, press the flange at an awkward angle and make an otherwise good fit feel rubbish.

Engorgement or a blocked area is making your breast tender

When breasts are very full, firm or lumpy, pumping may feel uncomfortable before milk begins to flow. Engorgement can make it harder for the flange to sit well and for your nipple to move freely. A tender, localised area may also be a sign of inflammation in the breast.

Try warmth very briefly before expressing if that feels soothing, then use gentle breast compressions while you pump. Afterwards, cool packs can help with swelling and tenderness. Avoid deep, forceful massage or trying to aggressively ‘work out’ a lump - sore breast tissue generally needs gentle handling, not a full-on wrestling match.

If you have a hot, red or painful area alongside flu-like symptoms, fever or feeling suddenly unwell, contact your GP, NHS 111 or maternity team promptly. Mastitis can need timely support.

A quick comfort reset before your next session

Before you press start, take thirty seconds to check the basics. Centre your nipple in the flange tunnel, make sure the cup has a proper seal and choose a bra that holds the pump in place without squashing your breast. Start on a low setting and give your body a moment to respond.

It can also help to look at your nipple immediately after pumping. It should not come out flattened like lipstick, sharply creased, blue or white, or dramatically swollen. Those signs can point to too much compression, a sizing issue or suction that is too strong.

If one side hurts and the other does not, do not assume you are doing anything wrong. It is common for breasts and nipples to behave differently. You may need a different flange size or suction level on each side. Your setup is allowed to be personalised.

When the pain feels burning, itchy or deep

Not all pumping pain is a fit problem. Burning or shooting pain, shiny or flaky nipples, itching, or pain that continues between pumps can have other causes, including skin conditions, infection or nipple vasospasm. Vasospasm often causes a nipple to turn white, purple or blue after feeding or pumping, particularly when cold.

Because these symptoms can overlap, self-diagnosing can be frustrating. Reach out to your health visitor, GP, midwife or a qualified breastfeeding supporter for a proper assessment. If you can, take a photo of any colour changes or skin damage and note when the pain happens. That detail can make it easier to work out what is going on.

Seek urgent medical advice if you have fever, chills, a rapidly spreading red area, pus, severe pain, or you feel significantly unwell. You deserve care, not a heroic attempt to power through.

Make pumping fit real life, not the other way around

A hands-free pump can make expressing feel far more doable while you make lunch, answer the door or simply sit with both hands free. But wearable does not mean you should ignore discomfort for the sake of getting things done. Take a moment to position it well, stay within a comfortable suction range and check your skin regularly in the early days.

At My Wren, we are firmly in favour of expressing yourself - but never at the expense of your comfort. There may be a little learning curve, especially when your milk supply and routine are still finding their feet. That does not mean pain is the price of pumping.

You are allowed to adjust the flange, lower the setting, replace the part, ask for help and try again tomorrow. Feeding your baby is big work. Your body deserves tools, time and tenderness that make it feel a little lighter.