D-MER (Dysphoric Milk Ejection Reflex): Why Let-Down Can Bring Sudden Sadness

You sit down to nurse, your baby latches, and out of nowhere a heavy wave of sadness, dread or irritability washes over you. A minute or two later, it’s gone, and you feel fine again. If this happens at every feed, you may be dealing with D-MER, short for dysphoric milk ejection reflex.

D-MER can be confusing and lonely, partly because so few people have heard of it. This guide explains what it is, what researchers think causes it, how it differs from postpartum depression, and what can help. The research is still limited, and we’ll say so where it is. For more on your own health while nursing, see our nutrition and health hub.

What is D-MER?

D-MER was first described in a 2011 case report by Heise and Wiessinger in the International Breastfeeding Journal. They defined it as an abrupt emotional drop that happens in some women just before milk release and lasts no more than a few minutes.

The key feature is timing. The feelings arrive right before the let-down reflex, when milk starts to flow, and they leave on their own. In the original case, each episode lasted about 90 seconds to 2 minutes. A 2019 study in Breastfeeding Medicine described episodes that came on suddenly and lasted less than 5 minutes.

Because it’s tied to the reflex rather than to breastfeeding itself, it can happen whenever milk lets down: while nursing, while pumping, or with a spontaneous let-down.

What D-MER feels like

People describe D-MER in different ways, and the intensity varies. Heise and Wiessinger grouped the feelings into three broad types:

• Depression-like: wistfulness, homesickness, hopelessness
• Anxiety-like: dread, irritability
• Anger-like: tension, agitation

In a 2024 survey of Japanese mothers published in the International Breastfeeding Journal, the most common symptoms were irritability (51.1%), anxiety (46.8%) and sadness (38.3%), followed by restlessness and tearfulness. A 2021 review in Frontiers in Global Women’s Health also mentions a hollow or churning feeling in the stomach.

Some mothers in the Japanese survey said they felt like failures or “disqualified” as mothers. Others described relief when they learned D-MER had a name and that they weren’t alone.

How common is D-MER?

Nobody knows for sure. The few estimates we have come from small studies:

Study	What it found
Ureño et al., 2019 (US)	9.1% prevalence, from a review of charts at the 6 to 8 week postpartum visit
Moriyama et al., 2024 (Japan)	47 of 202 mothers (23.3%) reported D-MER with at least one child

The Japanese study relied on mothers remembering past feeds, came from one city (Kagoshima, Japan) and had a 55.5% response rate, so its figure may not apply everywhere. What both studies suggest is that D-MER is not rare, and that many people with it never mention it: in the Japanese survey, 63.8% of mothers with D-MER hadn’t talked to anyone about it.

When does it start, and does it go away?

In the Japanese survey, about a quarter of mothers noticed it as soon as they started breastfeeding, and 38.3% within the first month. In the 2011 case report, more than half of the mothers who had contacted the authors realized something was wrong within 2 weeks of birth, although it often took longer to link it to let-down.

Heise and Wiessinger described a spectrum, based on reports from mothers rather than a formal study:

• Mild: usually eases on its own within the first 3 months.
• Moderate: often eases between 6 and 12 months.
• Severe: may not fully resolve until weaning and may include brief thoughts of suicide.

Why does D-MER happen?

The short answer is that no one has proven the cause. The leading idea, proposed by Heise and Wiessinger, is that a brief drop in dopamine, a brain chemical involved in mood and reward, happens alongside the rise in oxytocin that triggers let-down. In most people this goes unnoticed. In some, it may cause a short burst of negative feelings.

The 2021 review agrees that dopamine is the most likely candidate, but describes oxytocin and prolactin as other possible pieces of the puzzle. It stresses that these are hypotheses, and that the evidence is still largely anecdotal. In other words, D-MER is real to the people who experience it, but the science behind it is at an early stage.

D-MER vs. postpartum depression

D-MER and postpartum depression can look similar, but they’re not the same:

	D-MER	Postpartum depression
Timing	Just before let-down, lasting minutes	Most of the day, nearly every day
Between episodes	You feel like yourself	Low mood persists
How long	Each episode passes within minutes	Symptoms last at least 2 weeks
Treatment	No approved treatment; coping and support	Usually needs treatment to improve

The National Institute of Mental Health describes postpartum depression as a persistent sad, anxious or empty mood most of the day, nearly every day, for at least 2 weeks, and says women with postpartum depression generally won’t feel better without treatment. The 2019 study concluded that D-MER is a different experience from postpartum depression.

The two can overlap, though. The 2021 review notes that depressive symptoms can occur alongside D-MER, and mothers sometimes mistake one for the other. If you aren’t sure which you’re experiencing, talk to your provider.

Coping with D-MER

There’s no approved treatment for D-MER, and research on what helps is limited. These are the approaches described in the studies:

• Knowing what it is. The case report authors say reassurance is central, and that simply knowing D-MER is not dangerous is often enough to make it bearable.
• Distraction. Music, a show, a snack, a phone call or reading something uplifting during let-down. Distraction was one of the most common coping methods in the Japanese survey.
• Riding it out. Reminding yourself that the feeling will pass in a minute or two.
• Lowering stress where you can. The 2021 review mentions reducing breastfeeding-related stress and creating a safe environment.
• Tracking it. Noting when episodes happen and how strong they are can help you and your provider see patterns. In the case report, one mother found acute stress and caffeine made her symptoms worse. That was one person’s experience, not a proven trigger, but it’s worth noticing your own. Our guide to caffeine while breastfeeding covers how much is considered fine.
• Talking therapy. A 2024 case report in Frontiers in Psychiatry described a mother whose D-MER was significantly less in duration and intensity after six months of psychotherapy, although she still had D-MER. It’s a single case and can’t show that therapy works for others.

Some case reports describe medicines being tried for severe D-MER, but none is approved for it. Any medicine decision belongs with your doctor, who can weigh it against breastfeeding.

Being exhausted can make everything feel harder. If you’re running on empty, our guide on whether breastfeeding makes you tired has practical ideas.

If you decide to wean

Some parents with severe D-MER decide to stop breastfeeding. In the Japanese survey, 15% of mothers with D-MER did. That’s a legitimate choice. If you go that route, our guide on how to stop breastfeeding explains how to plan it. Mood changes can also happen after weaning, which we cover in post-weaning depression.

When to get help

Tell your doctor, midwife or a lactation consultant about D-MER, even if it feels embarrassing. Many health professionals haven’t heard of it, so it helps to describe the timing clearly: “I feel a wave of dread right before my milk lets down, and it goes away within minutes.”

Get help soon if:

• the low mood, anxiety or irritability lasts beyond let-down or most of the day,
• you’ve felt this way for more than 2 weeks,
• you’re losing interest in things, struggling to sleep when you can, or finding it hard to care for yourself or your baby, or
• D-MER is making you dread every feed.

Get help right away if you have thoughts of harming yourself or your baby. The NIMH lists these resources:

• 988 Suicide & Crisis Lifeline: call or text 988, or chat at 988lifeline.org.
• National Maternal Mental Health Hotline: call or text 1-833-852-6262 for free, confidential support 24/7.
• Emergency: call 911 or go to the nearest emergency room for life-threatening situations or symptoms such as confusion or hallucinations.

You can also find lactation consultants and peer support through our breastfeeding support page. D-MER is not your fault, and you don’t have to push through it alone.