Key Takeaways
- Women and men develop bipolar disorder at about the same rate, but women are more often diagnosed with bipolar II, rapid cycling and mixed episodes.
- Because bipolar II is dominated by depression, women are often treated for depression for years before hypomania is recognized.
- Childbirth is the clearest hormonal trigger; evidence for the menstrual cycle and perimenopause is real but limited and varies from person to person.
- Estrogen-containing birth control can cut lamotrigine levels roughly in half, and carbamazepine can make hormonal birth control fail, so tell your prescriber before any change.
Bipolar disorder affects women and men at roughly equal rates, but the illness often takes a different shape in women. Research reviews find women are more likely to have bipolar II, rapid cycling and mixed episodes, and to be first seen for depression rather than for highs. Reproductive events add another layer: the weeks after childbirth carry a well-documented spike in risk, and some women notice changes around their periods or in perimenopause. This page walks through what the evidence actually shows at each life stage, where it is thin, and the medication and birth control interactions every woman with bipolar disorder should know about.
Same overall rate, different pattern
According to NIMH, based on national survey data collected in 2001 to 2003, about 2.8% of U.S. adults had bipolar disorder in the past year, with nearly identical figures for men (2.9%) and women (2.8%). The Merck Manual reports a similar picture from a worldwide sample. So bipolar disorder is not a "women's illness." What differs is the pattern.
A review of sex differences by Diflorio and Jones found that most studies report a higher risk in women of three things:
- Bipolar II and hypomania rather than full mania. The Merck Manual likewise notes bipolar II incidence is "somewhat higher in women," while bipolar I is about equal. See bipolar II disorder for how it is defined.
- Rapid cycling, meaning four or more mood episodes in a year (rapid cycling explained).
- Mixed episodes, where depressive and manic symptoms overlap.
The same review found no consistent sex difference in age at onset, the polarity of the first episode, overall severity, response to treatment or suicidal behavior. That matters: it means women are not "more fragile" with this illness. The distinctions are in shape and timing, and above all in the effect of childbirth.
Why women are often diagnosed with depression first
Bipolar II is defined by at least one hypomanic episode and at least one major depressive episode. NIMH notes that many people with bipolar II spend long stretches in a low-grade depressive state and may seek help only for the depression, so the hypomania goes unnoticed. Hypomania by definition does not cause marked impairment, and it can feel like a welcome burst of energy after months of low mood.
Put those facts together with a higher rate of bipolar II in women, and the result is predictable: many women are treated for unipolar depression for years. In one survey of people with bipolar disorder, 69% had first been misdiagnosed, most often with depression. If antidepressants have stopped working, or made you feel wired, sleepless or agitated, that history is worth raising. Our page on telling depression from bipolar disorder covers the clues in detail.
Signs women describe that point toward hypomania rather than "a good week" include needing much less sleep without feeling tired, talking faster, starting many projects, spending more than usual, or friends commenting that you seem unlike yourself. Partners and family often notice these shifts before you do.
The menstrual cycle: what the research shows
Many women with bipolar disorder report that symptoms worsen in the days before their period. A 2022 narrative review of 22 studies concluded that a subset of women with bipolar disorder seem vulnerable to menstrual cycle effects, but that the pattern of mood change is not clear and the topic is "largely understudied." Some studies found premenstrual worsening; others did not, and results differed by bipolar type.
In practice, the most useful tool is your own data. Logging mood, sleep and cycle day for two or three months (a mood tracker works well) shows whether your episodes cluster around a particular phase. Premenstrual dysphoric disorder (PMDD) can also occur alongside bipolar disorder, and the two need to be told apart, because a predictable premenstrual dip calls for a different conversation than a full mood episode that happens to start near a period.
Perimenopause and menopause
The years around menopause may be a vulnerable time. A 2017 systematic review in Bipolar Disorders pooled nine small studies (273 women in total) and found menopause was associated with increased bipolar symptoms, especially depression, which was reported by 46% to 91% of participants across studies. The authors were careful to call the evidence preliminary: most of it came from women recalling their symptoms after the fact.
What that means for you: new or worsening depression, poor sleep, or a change in your usual pattern in your 40s or early 50s deserves attention rather than being written off as "just hormones." It is also not proof that estrogen is the cause. Thyroid problems, sleep disruption from night sweats, life stress and medication changes can all contribute, and a careful evaluation looks at each. Claims that estrogen swings directly "trigger rapid cycling" go beyond the current evidence.
After childbirth: the clearest hormonal link
The best-established reproductive effect is postpartum. In a large UK study of women with mood disorders, those with bipolar I had about a 50% risk of a major mood episode in each pregnancy and postpartum period, and those with bipolar II about 40%. Most episodes started within the first month after delivery, with mania and psychosis tending to start earliest.
Postpartum psychosis is rare in the general population but much more likely in women with bipolar disorder, and it is a medical emergency. Read postpartum psychosis warning signs if you or someone close to you is pregnant or recently gave birth. For planning before and during pregnancy, including how continuing treatment affects relapse risk, see bipolar disorder, pregnancy and postpartum.
Birth control and bipolar medications
Interactions between mood medications and hormonal contraception run in both directions, and they are easy to miss because different clinicians often prescribe each one.
| Medication | Interaction (from the FDA label) | What to do |
|---|---|---|
| Lamotrigine (Lamictal) | Estrogen-containing birth control pills lower lamotrigine levels by about half. During the pill-free week, levels can rise, by as much as double. Hormone therapy (HRT) may have a similar effect but has not been well studied. | Tell your prescriber before you start or stop the pill, patch, ring or HRT; the label says most people will need a dose adjustment. |
| Carbamazepine (Equetro) | Can speed the breakdown of hormonal contraceptives, including pills and implants, which can lead to contraceptive failure. | Discuss a non-hormonal or barrier method, or a different medication. |
| Valproate (Depakote) | Not a contraceptive interaction, but the label says it should not be used in women who could become pregnant unless other medications have failed, and then only with effective contraception. | If you take valproate and could become pregnant, talk with your prescriber about contraception and alternatives now. |
Never adjust a dose yourself to "match" a pill pack; the lamotrigine label specifically advises against changing the dose only during the pill-free week. More on how lamotrigine is used is on our lamotrigine for bipolar disorder page.
Other risks worth knowing
- Alcohol. In one study of bipolar outpatients, fewer women than men had a lifetime alcohol use disorder, but compared with the general population the added risk was larger for women (odds ratio 7.35 versus 2.77 for men). Alcohol worsens sleep and mood stability, so it is worth an honest conversation.
- Suicide attempts. An international task force review found female sex among the factors linked to suicide attempts in bipolar disorder, along with depressive episodes and anxiety. If you are having thoughts of suicide, call or text 988, or chat at 988lifeline.org.
- Thyroid and other medical causes. Thyroid disease can mimic or worsen mood symptoms (NIMH), so basic labs are part of a good workup.
Where hormones fit in treatment
Hormonal changes can worsen bipolar disorder, but they do not replace the diagnosis. Hormone therapy is not a treatment for bipolar disorder, and no one should stop a mood stabilizer because a hormone level looks off. What a hormone-aware evaluation adds is context: mapping episodes against cycles, pregnancy and perimenopause, checking thyroid function, and making sure contraception and any HRT are compatible with mood medication. Our guide to hormones and mental health explains the general connection.
At Willow & Stone, Dr. Stacey Forbes, a board-certified psychiatric-mental health nurse practitioner, evaluates mood and hormonal health together and offers hormone evaluation in-house. Learn about bipolar disorder treatment at Willow & Stone, or start with the complete bipolar disorder guide.
Common Questions
What are the signs of bipolar disorder in women?
The core symptoms are the same as in men: episodes of depression plus periods of mania or hypomania (high energy, less need for sleep, racing thoughts, impulsive choices). Women are more likely to have bipolar II, rapid cycling and mixed episodes, so the illness often looks like recurring depression with shorter, milder highs that are easy to miss.
Is bipolar disorder more common in women?
Overall, no. NIMH survey data show nearly identical past-year rates in women (2.8%) and men (2.9%). Bipolar II, however, appears somewhat more often in women, according to the Merck Manual, while bipolar I is about equally common.
Can PMDD be mistaken for bipolar disorder?
It can, because both involve mood shifts. PMDD symptoms are tied to the days before a period and lift soon after it starts, every cycle. Bipolar episodes last days to weeks and do not follow the cycle reliably. Some women have both. Tracking mood alongside cycle days for a few months helps a clinician tell them apart.
Does menopause make bipolar disorder worse?
It may for some women. A 2017 systematic review found menopause was associated with more bipolar symptoms, especially depression, but the studies were small and mostly relied on recall, so the authors called the evidence preliminary. New symptoms in midlife deserve an evaluation that also checks thyroid function, sleep and medications.
Does birth control affect lamotrigine?
Yes. The FDA label says estrogen-containing birth control pills lower lamotrigine levels by about 50%, and levels can rise during the pill-free week. Tell your prescriber before starting or stopping the pill, patch, ring or hormone therapy so the dose can be reviewed. Do not adjust it yourself.
Can hormone therapy treat bipolar disorder?
No. Hormone therapy is not a treatment for bipolar disorder, and no supplement or hormone replaces a mood stabilizer. Hormonal transitions can affect the course of the illness, so a good plan takes them into account, but medication decisions for bipolar disorder rest on the mood diagnosis.
Part of our bipolar disorder guide
Sources & Further Reading
- NIMH: Bipolar Disorder statistics (NCS-R national survey data)
- Merck Manual Professional: Bipolar Disorders (2026)
- Diflorio A, Jones I. Is sex important? Gender differences in bipolar disorder. Int Rev Psychiatry 2010
- Perich T et al. Menopause and illness course in bipolar disorder: a systematic review. Bipolar Disord 2017
- Impact of menstrual cycle events on bipolar disorder course: a narrative review. Arch Womens Ment Health 2022
- Di Florio A et al. Perinatal episodes across the mood disorder spectrum. JAMA Psychiatry 2013
- DailyMed: LAMICTAL (lamotrigine) prescribing information, 10/2025
- Frye MA et al. Gender differences in alcoholism comorbidity in bipolar disorder. Am J Psychiatry 2003
This article is general education, not a diagnosis or advice for your situation. Do not start, stop, or change a medication without talking to the clinician who prescribes it; stopping a mood stabilizer suddenly can trigger relapse.
If you need help right now
Willow & Stone is an outpatient practice and is not an emergency service. If you or someone you care about is in immediate danger, call 911.
For urgent mental health support at any hour, call or text 988 to reach the Suicide & Crisis Lifeline, or text HOME to 741741 for the Crisis Text Line. Both are free, confidential, and available 24/7 nationwide.
Dr. Stacey Forbes, DNP, APRN, PMHNP-BC
Board-certified Psychiatric-Mental Health Nurse Practitioner and founder of Willow & Stone Integrative Mental Health. Nearly two decades of clinical experience; integrative, root-cause psychiatry in person in Arlington and by telehealth. Licensed in Texas, New Mexico, Florida, Alaska, Arizona, Colorado & Washington.
About Dr. Forbes →