What is it?
Bipolar disorder is a psychiatric condition characterized by episodes of mood disturbance that alternate between periods of elevated mood (mania or hypomania) and periods of depression. It affects approximately 2.8% of U.S. adults in a given year (NIMH). Bipolar disorder is frequently misdiagnosed, most often as unipolar depression, and the average time from symptom onset to accurate diagnosis is 6 to 10 years (Scott et al., 2022).
The condition exists on a spectrum. Bipolar I involves full manic episodes that may include psychotic features. Bipolar II involves hypomanic episodes alternating with major depressive episodes. Cyclothymic disorder involves chronic, fluctuating mood disturbances that do not meet full criteria for either mania or major depression.
Clinical presentation
Depressive episodes in bipolar disorder are clinically indistinguishable from unipolar major depression on cross-sectional assessment. This is the primary reason bipolar disorder is so frequently misdiagnosed. Patients spend significantly more time in depressive episodes than in mania, and depression is typically the presenting complaint.
Hypomanic episodes are particularly difficult to identify because patients often experience them as periods of high productivity and well-being. During hypomania, a person may sleep less without feeling tired, take on multiple projects, speak more rapidly, and make impulsive decisions. These episodes are frequently recalled positively and may not be reported unless specifically asked about.
Mixed features, in which symptoms of depression and mania occur simultaneously, are particularly dangerous because they combine the energy of mania with the despair of depression. Patients in mixed states are at highest risk for suicidal behavior.
Evaluation
The diagnostic challenge is not identifying mania in a currently manic patient. It is identifying a history of hypomania in a patient who presents with depression. This requires a detailed longitudinal history that most brief evaluations do not capture.
Comorbidity rates are high. About half or more of people with bipolar disorder have an anxiety disorder at some point in their lives (Pavlova et al., 2015). Rates of ADHD in bipolar disorder range from 10% to 20% (Schiweck et al., 2021). Substance use disorders occur in at least a third of people with bipolar disorder, and in more than half of those with bipolar I (Hunt et al., 2016).
The consequences of misdiagnosis are significant. Treating bipolar depression with an antidepressant alone can trigger manic episodes, accelerate mood cycling, or produce a mixed state. Patients prescribed stimulants for presumed ADHD may experience mania. These iatrogenic complications are avoidable with accurate initial diagnosis.
Treatment
The foundation of bipolar treatment is mood stabilization, not antidepressant therapy. First-line options include lithium, valproate, lamotrigine (particularly effective for bipolar depression), and atypical antipsychotics. We select among these based on predominant mood polarity, comorbid conditions, tolerability, and reproductive considerations.
We approach polypharmacy cautiously. Many patients arrive on three or four medications prescribed without a unifying diagnostic formulation. Deprescribing unnecessary medications often improves tolerability and adherence. For patients with comorbid ADHD, stimulant treatment is approached carefully and only after mood stabilization is established.
Longitudinal mood and family history
Our evaluation is specifically designed to catch what brief assessments miss. We obtain a detailed longitudinal mood history, family psychiatric history (bipolar disorder is among the most heritable psychiatric conditions), and a thorough medication trial review. Two of our three physicians completed neuropsychiatry fellowships at Stanford. We do not prescribe benzodiazepines.
Frequently asked questions
How is bipolar disorder different from depression?
The distinguishing feature is the presence of manic or hypomanic episodes, either currently or historically. Because patients spend most of their time in depression, bipolar disorder is frequently misdiagnosed as unipolar depression. Accurate diagnosis requires a detailed mood history that captures past episodes of elevated mood.
Why is bipolar disorder often misdiagnosed?
Patients present during depressive episodes and do not spontaneously report past hypomania, which often feels productive rather than pathological. Brief evaluations without a structured mood history frequently miss the diagnosis. The average delay is 6 to 10 years.
Can you have bipolar disorder and ADHD at the same time?
Yes. ADHD co-occurs in 10% to 20% of adult bipolar cases. The two share features including impulsivity and restlessness. Stimulant treatment for ADHD must be approached carefully, typically only after mood stabilization.
Why is it dangerous to treat bipolar depression with antidepressants alone?
Prescribing an antidepressant without a mood stabilizer can trigger mania, accelerate mood cycling, or produce a dangerous mixed state combining depressive despair with manic energy.
Before your first visit
The evaluation builds a detailed mood history that captures past episodes of elevated mood, along with your family psychiatric history and a review of past medication trials. After you request an appointment, our office sends intake forms through the patient portal; they are completed before the first visit so your physician has time to review them.
This information is for educational purposes only and does not constitute medical advice, diagnosis, or treatment recommendations. Always consult a qualified physician before making medication or treatment decisions. Content reviewed by physicians at Bay Area Neuropsychiatry who are board-certified by the American Board of Psychiatry and Neurology.