Research links menstrual cycle regularity to symptom severity in women with bipolar disorder

A new study suggests that women with bipolar disorder who have regular menstrual cycles report more severe premenstrual symptoms than those with irregular cycles. This preliminary result was shared at the 2026 ECNP Congress in Munich according to reports from two outlets. Both sources highlight this unexpected link between cycle regularity and symptom severity among women of reproductive age.

The study surveyed 267 women of reproductive age with bipolar disorder led by researchers in Norway and international collaborators. About 62 percent of the participants had regular menstruation while 38 percent reported irregular cycles. Data was collected through an online survey for this presentation at the congress.

Participants with regular periods were more likely to report symptoms like irritability, anger, and relationship difficulties during the premenstrual phase. Physical symptoms and significant distress affecting work or activities were also common in this group. These issues occurred in every or almost every premenstrual phase over the last year for those affected.

The research also found that women with regular cycles were less likely to use hormonal contraceptives than those with irregular cycles. Most of the women had tried these hormone-based methods but a larger share of the regular cycle group stopped due to side effects. They expressed more reluctance to continue using hormones as a result.

Lead researcher Dr. Sofie Ragnhild Aminoff from Oslo University Hospital called this an unexpected finding. She noted it raises questions about whether some women with bipolar disorder are especially sensitive to hormonal contraceptives. Others might potentially benefit from them according to her statement.

Bipolar disorder involves episodes of depression and elevated or irritable mood along with periods of few symptoms. Around 1 percent to 2 percent of women have this condition which affects approximately 235,000 women of childbearing age in countries like the U.K. or France. Reproductive health in women with severe mental illness remains an understudied area.

Many women report that their premenstrual symptoms are not taken seriously and few receive the treatment they need. Clinicians currently have very limited guidance on how best to help manage these changes. Dr. Aminoff emphasized that symptoms need to be taken seriously by the health care system.

The authors stress that assessment of symptom burden alongside tailored hormonal contraception should be standard care. They call for closer collaboration between psychiatry and gynecology to support better-informed decisions. Clearer clinical guidelines are needed so women can make choices about mood-stabilizing medication and contraception.

Independent experts agreed that premenstrual symptoms need more attention and linked sensitivity to hormonal change with relapse risks during pregnancy. They noted this area has been ignored for too long but the findings remain preliminary. Dr. Clare Dolman from Bipolar UK and Professor Louise Howard from King's College London supported the call for more research.

The work has not yet been submitted to a peer-reviewed journal so further investigation is required. The authors stress that the findings are preliminary and come from an online survey. Additional studies will be needed to confirm these results before changing clinical practice.