In This article
- D-MER is characterized by brief, intense negative emotions that occur just before and during milk letdown and resolve within minutes.
- Symptoms are emotional (sadness, dread, anxiety, shame, anger) and may be accompanied by physical sensations such as nausea or loss of appetite.
- Prevalence estimates vary widely, and D-MER often co-occurs with higher levels of depression, anxiety, stress, and self-harm thoughts on screening tools like the EPDS.
- D-MER is distinct from postpartum depression but may be more common in women with a prior psychiatric history.
- Management focuses on education, validation, lactation and community support, stress reduction, and treating co-occurring depression, anxiety, or sleep problems as needed.
Breastfeeding is often portrayed as a pleasant and fulfilling experience, but for some nursing mothers with a condition known as Dysphoric Milk Ejection Reflex (D-MER), breastfeeding may be associated with unwanted, profoundly negative emotions. First described in 2008, D-MER is characterized by sudden feelings of dysphoria, most commonly intense feelings of sadness, dread, or anxiety, that occur just before and during milk ejection or “letdown”.
D-MER remains poorly understood, and many mothers, as well as healthcare providers, are not familiar with this breastfeeding complication.
What is D-MER?
D-MER symptoms can vary widely but often include intense emotional responses, including overwhelming sadness, guilt, shame, worthlessness, a sense of doom, or even anger. In a sample of 42 women with D-MER, the most frequent D-MER-related emotions were oversensitivity, tension, frustration, and anxiety.
Some descriptions of D-MER have also documented physical symptoms, including nipple pain, nausea, food revulsion, appetite loss, and extreme thirst.
These feelings occur with any letdown of breast milk, whether associated with breastfeeding, pumping breast milk, or breast engorgement. The symptoms subside as breast milk begins to flow, but they can recur with each milk ejection. An episode of D-MER typically lasts between 30 seconds and 10 minutes.
Another experience associated with breastfeeding, called Breastfeeding Aversion Response (BAR), involves feelings of disgust and an overwhelming urge to unlatch the baby. Unlike BAR, D-MER is specifically linked to the milk ejection reflex and subsides after milk starts to flow, while the emotional responses associated with BAR persist until the baby unlatches.
How Common is D-MER?
No large epidemiologic studies have examined the prevalence of D-MER. The reported prevalence of D-MER has varied considerably across studies, with reported rates ranging from 5.9% to 28%. This wide variation across studies reflects inconsistent and shifting definitions of D-MER.
The largest study to date was an online cross-sectional survey, in which a novel questionnaire for D-MER was used to assess 711 women up to 12 months postpartum. In this study, Zutic and colleagues documented a prevalence of 5.9%.
What Causes D-MER?
The exact cause of D-MER is not well established but is believed to involve the hormonal changes that occur during milk ejection, particularly fluctuations in levels of oxytocin and dopamine. Researchers hypothesize that rising levels of oxytocin, typically associated with feelings of connection and well-being, may instead trigger a stress response in women with D-MER.
Another possible explanation is that D-MER symptoms are triggered by a drop in dopamine levels. Dopamine levels fall rapidly just before and during milk letdown. This temporary decrease in dopamine is necessary for the rise in prolactin needed for milk production.
However, these are both hypotheses; no studies have examined physiologic or homonal changes in women with D-MER.
Ureno and colleagues have noted that in those with D-MER, certain factors may exacerbate D-MER symptoms, including sleep deprivation (54.5%), stress (46.5%), extended time between feeds/engorgement (24.2%), and caffeine (20.2%).
Is There a Connection Between D-MER and Postpartum Depression?
While D-MER can contribute to or coexist with postpartum depression or anxiety, it is distinct and should not be confused with these conditions. In contrast to postpartum depression, where depressive symptoms are persistent, the negative feelings of D-MER are brief and occur only during milk letdown.
While D-MER is distinct from postpartum depression, women experiencing D-MER often report higher levels of depression, anxiety, and stress. In one study, almost 60% of women with D-MER had a score 13 or higher on the EPDS, indicating probable depression. In addition, based on item 10 of the EPDS, a large number of women with D-MER (38.1%) reported having thoughts about hurting themselves.
Several cross-sectional studies have shown that D-MER may be more common among women with a history of psychiatric illness prior to pregnancy. A study from Ureño et al reported that 75% of mothers with D-MER had previously been diagnosed with anxiety and/or depression, and 14% had been diagnosed with PPD. Zunic and colleagues reported that a significantly higher proportion of women with D-MER (19%) had a history of psychiatric illness, compared to 8.1% of women without D-MER. In another study, women with D-MER symptoms were more likely to report a history of panic attacks prior to pregnancy (28.6 vs. 12.2%, OR 2.87; Howard et al, 2025).
Treatment and Support
D-MER can undermine a new mother’s confidence in her ability to parent and her experience of breastfeeding self-efficacy. D-MER may negatively affect bonding with the infant, and may also contribute to weaning earlier than planned. In one study, nearly half of women with D-MER stopped breastfeeding because of these symptoms.
Given the lack of extensive research on D-MER, treatment options are largely anecdotal and supportive. Here are some strategies that may help manage D-MER:
- Awareness and Validation: Recognizing D-MER as a legitimate condition can help women feel understood and supported. Healthcare providers should be aware of D-MER so they can avoid misdiagnosis and offer appropriate support. D-MER is not a sign of ambivalence regarding breastfeeding or motherhood.
- Lifestyle Adjustments: Interventions to reduce stress, such as mindfulness, relaxation, and skin-to-skin contact with the baby, may alleviate the intensity of D-MER symptoms. Ensuring sufficient sleep or efforts to improve sleep quality may also reduce the frequency of D-MER symptoms.
- Breastfeeding Support: Because D-MER can affect a woman’s confidence in breastfeeding, it may be helpful to engage the support of a lactation consultant to optimize breastfeeding and to provide additional reassurance and support.
- Community Support: Sharing experiences online or with support groups can provide valuable emotional support and help women feel less isolated and ashamed about the symptoms they experience in the context of breastfeeding. The website D-MER.org offers information and community support.
- Psychotherapy and Medication: While there is limited specific treatment for D-MER, psychotherapy may help women to understand D-MER and adjust to the psychological impact of the condition. No studies have evaluated any medications for the treatment of D-MER but may be indicated for the treatment of depression, anxiety, and sleep problems.
Recommendations for Healthcare Providers
Information about D-MER for healthcare providers is limited. Two recent reviews summarize clinical findings and treatment recommendations (Middleton et al 2025, Schildkrout et al 2025).
- Education and Awareness: Healthcare providers should be educated about D-MER to recognize its symptoms and differentiate it from other postpartum conditions.
- Supportive Care: Offer emotional support and validation to women experiencing D-MER, acknowledging the distress it causes.
- Screening for Postpartum Depression and Anxiety: Although D-MER is distinct from PPD and PPA, stress surrounding breastfeeding may increase vulnerability to postpartum mood and anxiety disorders.
- Research and Development: Encourage further research into the causes and effective treatments for D-MER to improve breastfeeding experiences and maternal mental health outcomes.
By acknowledging and addressing D-MER, we can better support breastfeeding mothers and enhance their overall well-being.
—Ruta Nonacs, MD PhD
