There are a number of important features that distinguish how women experience bipolar disorder vs. how men experience it and these differences must be accounted for in order to fully recognize bipolar disorder symptoms and create meaningful treatment experiences:
Onset
The age of onset is typically later for women than it is for men.
Depressive Episodes
Women are more likely than men to experience depressive episodes in the course of their illness and depression tends to be the predominant feature of the illness. In fact, 75% of women with bipolar disorder present with depression at the onset of the illness compared to 67% of men, and this depression tends to be more intense and last longer. This likely helps to explain why women are significantly more likely than men to be misdiagnosed with unipolar depression and subsequently treated with antidepressants. The high rate of misdiagnosis is alarming because it not only delays correct treatment, but because antidepressants are generally considered to be inappropriate for people with bipolar disorder due to both inefficacy and the risk of triggering mood switching. Both the prevalence of depression and misdiagnosis may also partially explain why women with bipolar disorder are significantly more likely than men to attempt suicide.
Bipolar II
Bipolar II disorder, which is defined as cycling between depression and hypomania, is more common amongst women, with some estimating that women are a full 50% more likely than men to experience the condition. Mood switching is an inherent feature of bipolar II and people with this condition generally tend to have more frequent and more severe depressive episodes than people with bipolar I, which does not always result in depressive episodes. This may also help to explain the higher suicide rate among women; people with bipolar II disorder are known to attempt suicide more frequently than bipolar I due both to the presence of depression and because more mood instability (switches between depression and mania or hypomania) is associated with higher suicide rates.
Mixed Mania
Some studies suggest that women are more likely than men to experience mixed mania, a state in which both depressive and manic symptoms are present simultaneously.
Rapid Cycling
Women are nearly twice as likely as men to experience rapid cycling, which means that they have four or more mood episodes per year. This augmented intensity of instability and frequency of mood switching can be deeply distressing, complicate treatment, and is associated with higher suicide rates. Some evidence suggests that the rapidity of cycling may be due in part to the fact that women are more likely to be prescribed antidepressants due to their more prevalent and severe depressive symptoms. Unfortunately, people who experience rapid cycling are at higher risk for treatment resistance, complicating the treatment process.
Seasonal Effects
Women are more likely than men to have seasonal features to their bipolar disorder. More specifically, women are more likely to have depressive episodes in the fall and winter than in the spring and summer.
Sleep
Sleep disturbances appear to be more likely to cause mood disturbances in women than men, and sleep patterns and quality seem to also be impacted by sex differences. The exact reasons for these differences are unknown, but it is clear that it is particularly important to identify and prevent disrupted sleep in women in order to help stabilize mood.
Hormonal Effects
Hormones are known to have a significant impact on mental health and this may be particularly true in bipolar disorder. The cyclical fluctuations women experience throughout their menstrual and reproductive cycles have been found to impact the severity of bipolar symptoms. As Sonia Parial writes, “Bipolar mood disorder may worsen during certain phases of the female reproductive cycle, particularly postpartum, but also during the premenstrual phase of menstrual cycle, peri-menopause, and menopause.” In particular, many women experience premenstrual depression and up to 70% of women with bipolar disorder report “premenstrual exacerbation of their symptoms.” These mood disturbances may constitute premenstrual dysphoric disorder, which is traditionally treated with antidepressants when there is no co-occurring bipolar disorder. However, antidepressant treatment may trigger mood switching and have questionable efficacy in people with bipolar disorder, which means that such treatment is not advisable in these cases. Additionally, hormonal birth control may impact bipolar symptoms.
Pregnancy also presents unique risks for women with bipolar disorder. Not only must bipolar symptoms be safely managed during pregnancy, potentially requiring significant treatment changes, the hormonal shifts during and after pregnancy can trigger both onset and relapse of bipolar disorder. The postpartum period may be a particularly vulnerable time, with a full 36% of bipolar women reporting onset and up to 40% reporting relapse in the six weeks following birth. Postpartum psychosis is also a significant risk and observed in up to 30% of women with bipolar disorder. Experiencing postpartum psychosis increases the risk of “recurrent affective episodes.”
Menopause and age-related loss of estrogen can also have serious implications for bipolar disorder in women. Perimenopausal and postmenopausal women often experience an intensification of mood symptoms, particularly depression. This is especially true in women who are not using hormone replacement therapy. Additionally, thyroid dysfunction can have a significant impact on bipolar disorder and women are much more likely than men to experience thyroid conditions. Elevated thyroid levels are associated with mixed episodes while subclinical hypothyroidism is associated with rapid cycling.
Co-Morbidity
People with bipolar disorder often experience co-occurring conditions that may affect and are affected by bipolar disorder itself. In women, anxiety, eating disorders, post-traumatic stress disorder (PTSD), and borderline personality disorder are more common than in men. Meanwhile, men are believed to be more likely to have a co-occurring substance use disorder. However, one study by the Stanley Foundation Bipolar Network found that women are more likely than men to experience a co-occurring alcohol use disorder. Overall, women with bipolar disorder are significantly more likely than women in the general population to abuse substances, despite their overall level not reaching that of men with the same disorder.
Sexual Violence
Women with bipolar disorder are more likely to have experienced sexual abuse than men. While this may in part reflect general higher rates of sexual victimization, it has important implications for the onset and course of the illness; sexual abuse is associated with an earlier age of onset and more suicide attempts. Additionally, women with bipolar disorder are at heightened risk for sexual violence.
Impact
Bipolar disorder can be deeply disruptive and have a damaging impact on functionality and quality of life both men and women. However, researchers have found that women “report significantly more disruption in social/leisure life,” suggesting that there are meaningful experiential differences between men and women. These disruptions are important to address in treatment in order to help women with bipolar disorder fully heal and restore both functionality and overall quality of life. Furthermore, women are more likely to be hospitalized than men, although this may be due in part to the higher willingness to seek treatment.