A large-scale study from Sweden found a strong two-way link between premenstrual disorders (including PMS and PMDD) and perinatal depression — depression that occurs during pregnancy or in the first year after giving birth. The research drew on medical records from over 1.8 million pregnancies between 2001 and 2018, making it one of the largest studies on this topic to date.
Women who had been diagnosed with a premenstrual disorder before pregnancy were nearly five times more likely to develop perinatal depression compared to women without such a history. The connection worked in the other direction too: women who experienced perinatal depression had about an 80% higher chance of later being diagnosed with a premenstrual disorder. These links held up for depression occurring both during pregnancy and after delivery.
Importantly, the association was even stronger among women who had no prior history of any psychiatric condition, suggesting that the connection between these two conditions is not simply explained by a general tendency toward depression or other mental health challenges. When the researchers compared sisters within the same family, the link was somewhat weaker but still clearly present, indicating that while shared genetics and family environment play a role, they do not fully explain the relationship. The researchers suggest both conditions may stem from a shared sensitivity to the natural hormonal shifts that occur during the menstrual cycle and around pregnancy.
For people living with PMDD or PMS, this research highlights the value of being aware that premenstrual disorders may increase vulnerability to depression during and after pregnancy. Similarly, those who have experienced perinatal depression may want to pay attention to premenstrual symptoms after their cycles return. Sharing a full mental health history — including premenstrual symptoms — with healthcare providers during preconception or prenatal care could support earlier recognition and planning.
Key findings
- Among women with PND, 2.9% had PMDs before pregnancy compared to 0.6% among matched controls; PMDs were associated with a nearly 5-fold higher risk of subsequent PND (OR 4.76, 95% CI [4.52, 5.01])
- Women with PND had approximately double the risk of subsequent PMDs compared to matched controls (HR 1.81, 95% CI [1.74, 1.88]) over a mean follow-up of 7.40 years
- The bidirectional association was observed for both prenatal depression (OR 4.58; HR 1.67) and postnatal depression (OR 5.03; HR 1.98)
- The bidirectional association was stronger among women without a history of psychiatric disorders (p for interaction <0.001 in both directions)
- Sibling comparison showed somewhat attenuated but still statistically significant bidirectional associations (e.g., OR 3.68 for PMDs→PND; HR 1.58 for PND→PMDs), suggesting shared genetic/familial factors partially but not fully explain the link
- Incidence rate of new PMD diagnoses was 7.6 per 1,000 person-years among women with PND versus 3.8 per 1,000 person-years among controls
Methods, briefly
Combined nested case-control study and matched cohort study using Swedish nationwide registers (Medical Birth Register, Patient Register, Prescribed Drug Register, Multi-Generation Register). N = 1,803,309 singleton pregnancies from 1,041,419 women (2001–2018). 84,949 PND cases were individually matched to 849,482 controls (1:10) on maternal age and calendar year using incidence density sampling. The matched cohort had a mean follow-up of 6.90–7.40 years. Conditional logistic regression estimated ORs for the PMDs→PND direction; stratified Cox regression estimated HRs for the PND→PMDs direction. Sibling comparisons using full sisters were conducted. Multiple sensitivity analyses were performed.
Limitations to keep in mind
- Findings based on clinical diagnoses in healthcare registers may not generalize to women with mild PMDs or PND who do not seek care
- Clinical diagnosis of PMDs in the Swedish Patient Register has not been formally validated, though sensitivity analyses with stricter diagnostic criteria yielded similar results
- Using antidepressant prescriptions as a proxy for PND may introduce misclassification, as antidepressants are prescribed for other conditions
- Lack of individual-level data on return of postpartum menstruation, though sensitivity analyses with varying follow-up start times showed consistent results
- Primary care visits are not fully captured in the Patient Register, potentially missing milder cases
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