D-MER: Why Breastfeeding Can Suddenly Make You Feel Awful
D-MER: Why Breastfeeding Can Suddenly Make You Feel Awful
You start feeding your baby and, completely out of nowhere, you feel it.
A wave of dread. Sadness. Anxiety. Irritability. Maybe even a horrible sinking feeling in the pit of your stomach.
Then, a minute or two later, it passes.
If this happens around the time your milk lets down, you might be experiencing Dysphoric Milk Ejection Reflex - or D-MER.
And if you’ve never heard of it before, you’re definitely not alone.
So, what exactly is D-MER?
D-MER is a sudden burst of negative emotion that happens just before or during the milk ejection, or “let-down”, reflex when breastfeeding or expressing milk. Symptoms tend to be brief - usually lasting only a few minutes - and then ease again.
That timing is one of the things that makes D-MER different from postnatal anxiety or depression.
With D-MER, you might feel completely fine before a feed, experience an intense emotional drop as your milk lets down, and then feel like yourself again shortly afterwards.
It can be incredibly unsettling, particularly if nobody has ever told you this is something that can happen.
What can D-MER feel like?
Everyone experiences it differently, but women commonly describe feelings such as:
dread or a sudden sinking feeling
sadness or hopelessness
anxiety or panic
irritability or agitation
feeling overwhelmed
nausea or a hollow feeling in the stomach
an urge to get away or stop feeding.
For some women, the emotions can be much more intense and include disturbing thoughts or thoughts about death or suicide. D-MER has been associated with significant psychological distress, and for some women symptoms contribute to stopping breastfeeding.
If thoughts about death or suicide are continuing outside the brief let-down period, feel difficult to control, or you’re worried about your safety, it’s important to seek urgent professional support rather than assuming it’s simply D-MER.
And no, you’re not imagining it
One of the most reassuring things about recognising D-MER is understanding that the emotional reaction appears to be linked to the physiology of milk release rather than something you’re deliberately thinking or feeling about your baby.
Researchers still don’t fully understand why it happens. Changes in dopamine around milk ejection are one proposed mechanism, but D-MER remains relatively under-researched and we don’t yet have a complete explanation.
So if you’ve been wondering, Why do I suddenly feel awful every time I breastfeed?, there may actually be a name for what you’re experiencing.
How common is D-MER?
Probably more common than we once thought.
Older research estimated D-MER affected around 9% of breastfeeding women, but more recent studies have reported rates ranging from around 6% to more than 20%, depending on how D-MER was defined and which group was studied. One large 2025 study found a prevalence of around 14%.
In other words: if this is happening to you, you are very much not the only one.
Knowing what it is can help
For some women, simply being able to recognise the pattern makes D-MER less frightening.
Instead of the feeling arriving and your brain immediately thinking, Why do I feel like this? What’s wrong with me?, you can start recognising:
Here it is. This is the let-down. It feels awful, but it will pass.
Because D-MER is usually brief, reminding yourself that the wave has a beginning and an end can make it easier to ride out.
Give your brain something else to do
This is one situation where distraction can be genuinely useful.
Have something ready for feeds: a podcast, television show, game on your phone, book, snack, cold drink or someone you can message.
The aim isn’t to pretend the feeling isn’t there. It’s simply to give your attention somewhere else to go while you wait for the wave to pass.
Relaxation or grounding strategies can help too - slow breathing, noticing what you can see and hear around you, or deliberately relaxing your shoulders and jaw.
There isn’t strong evidence yet that any one coping strategy reliably treats D-MER, so it’s worth experimenting with what makes feeds easier for you.
Make feeding as easy on yourself as possible
Stress and sleep deprivation appear to make D-MER worse for some women, so anything that reduces the overall load may help. In one recent study, women commonly reported sleep and partner support as helpful.
That might mean feeding somewhere comfortable, handing everything else over to your partner during feeds, having food and water within reach, or asking for more practical help when you’re exhausted.
Interestingly, some women also report experiencing milder D-MER while pumping than breastfeeding, although this certainly isn’t true for everyone.
You’re allowed to rethink breastfeeding
D-MER can range from mildly unpleasant to genuinely unbearable.
If you want to continue breastfeeding, support from your GP, lactation consultant, maternal-child health nurse or psychologist can help you work out ways to make it more manageable.
But continuing breastfeeding at any cost isn’t the goal.
If D-MER is having a major impact on your wellbeing and you decide to combination feed, express or move to formula, that is a valid feeding decision too.
Your mental health is part of the equation.
Most importantly: tell someone
D-MER can be surprisingly isolating because many women don’t know it exists, and healthcare professionals might not always ask about it.
If every let-down is accompanied by a wave of dread, sadness, anxiety or another intense emotional reaction, mention it to someone involved in your care.
Sometimes the most helpful first step is realising:
There’s a name for this. Other women experience it too. And you don’t have to just grit your teeth through every feed.
If any of this feels familiar, we’re here to help. Contact us to find out more about how we can support you.
