Bipolar I Disorder

Bipolar I disorder is the form of bipolar disorder defined by mania. One manic episode, lasting at least a week or severe enough to need hospital care, is enough for the diagnosis, and most people also have depressive episodes over time. Mania can include psychosis and often disrupts work, money and relationships, so the acute phase sometimes needs a hospital. Bipolar I is very treatable, though: with ongoing maintenance treatment many people have long stretches of stability. This page explains the diagnosis, what happens in a crisis, and what steady outpatient care looks like afterward.

When to get emergency care

This page is general education. Outpatient practices, including ours, are not emergency services.

What defines bipolar I

NIMH describes bipolar I as manic episodes lasting at least seven days, most of the day nearly every day, or manic symptoms so severe that hospital care is needed. Separate depressive episodes, typically lasting at least two weeks, usually occur as well. The 2023 VA/DoD guideline puts the rule more simply: at least one manic episode, with or without depression.

That makes bipolar I different from bipolar II, where the highs never reach mania. If you are unsure which applies, our comparison of bipolar I and II lays it out. For the condition as a whole, see the complete bipolar disorder guide.

The manic episode in brief

According to the Merck Manual summary of DSM-5-TR, a manic episode is a distinct period of abnormally elevated, expansive or irritable mood plus increased activity or energy, lasting at least a week (or any length if hospitalization is needed), with at least three other symptoms, or four if the mood is only irritable. The other symptoms include less need for sleep, pressured speech, racing thoughts, distractibility, inflated self-esteem, a burst of goal-directed activity, and risky choices.

What sets mania apart from hypomania is consequence: marked trouble at work or home, psychosis, or a need for hospital care. We keep the symptom detail on mania symptoms: what a manic episode looks like, including how substances and some medicines can set off manic symptoms.

Psychosis in bipolar I

Psychosis means losing touch with reality through delusions (fixed false beliefs) or hallucinations. During mania these often fit the mood, for example believing one has a special mission or extraordinary powers; NIMH notes psychotic symptoms tend to match the person's extreme mood. Psychosis can also occur during severe depression.

Because of psychosis, bipolar I is sometimes mistaken for schizophrenia, a risk NIMH specifically flags. The timeline of mood and psychotic symptoms is what separates them. Read more in psychosis in bipolar disorder.

Hospital and higher levels of care

Severe mania can make it impossible to stay safe at home: no sleep for days, reckless spending or driving, aggression, or psychosis. In those situations a hospital, crisis stabilization unit or intensive program provides around-the-clock care, rapid medication adjustment and a safe setting until the episode settles.

Hospital care is a phase, not a verdict on the future. Many people return home and continue treatment as outpatients. The weeks after discharge are a time to set up outpatient follow-up and a relapse plan.

Willow & Stone is an outpatient practice. If a higher level of care is needed (for example during severe mania or psychosis), we help you find it.

Course over a lifetime

The APA puts the average age of onset in the mid-20s. The VA/DoD guideline, citing a systematic review, describes three onset peaks (average ages about 19, 25 and 29) and notes that only about 20% of bipolar I cases start after age 40. A first manic episode later in life should prompt a careful search for medical causes.

NIMH describes bipolar disorder as usually needing lifelong treatment; it does not go away on its own. Without treatment episodes tend to recur, and some people develop rapid cycling (four or more episodes in a year). The VA/DoD guideline cites an estimate of roughly 10 years of potential life lost. That is the strongest argument for steady, preventive care rather than treating only crises.

Maintenance treatment: preventing the next episode

Once an episode is controlled, the goal changes from calming symptoms to preventing recurrence. Guideline positions, named here without doses:

• NICE CG185 advises offering lithium as a first-line, long-term treatment and describes it as the most effective long-term treatment for bipolar disorder. Learn more about lithium for bipolar disorder.
• The 2023 VA/DoD guideline recommends lithium or quetiapine to prevent manic recurrence and lamotrigine to prevent depressive recurrence.
• CANMAT/ISBD 2018 lists lithium, quetiapine, divalproex, lamotrigine, asenapine and aripiprazole among first-line maintenance options for bipolar I, plus some combinations.
• In bipolar I, an ISBD task force advises that antidepressants be used only as an add-on to a mood stabilizer, never alone.

Medication works best combined with psychotherapy. In a trial of 175 people with bipolar I, those who received interpersonal and social rhythm therapy during the acute phase went longer without a new episode (Frank et al., 2005).

Stopping a mood stabilizer suddenly raises the risk of relapse. Any change, including tapering, should be planned with your prescriber.

Physical health and other conditions

Bipolar I rarely travels alone. NIMH lists anxiety disorders, ADHD, alcohol and drug misuse and eating disorders as common companions. In clinical samples, about 42% of people with bipolar disorder had an alcohol use disorder at some point (Hunt et al., 2016), and the VA/DoD guideline cites a smoking rate of about 49%.

Those numbers matter because substances can trigger episodes and interfere with medication, and because physical health problems add to the overall burden of the illness. NICE CG185 recommends an annual physical health check for everyone with bipolar disorder (weight, blood pressure, blood sugar and lipids), with kidney, thyroid and calcium tests added for people on long-term lithium. Treating bipolar I well means looking after the whole body, not only mood.

What outpatient care looks like once you are stable

Most of life with bipolar I is lived between episodes, and that is where outpatient care does its work. A typical plan includes:

• Scheduled medication management visits to review benefits, side effects and any early symptoms
• Lab monitoring ordered as needed for the medicines you take, such as lithium levels, kidney and thyroid tests
• A written relapse plan: your personal early warning signs, who to call, and what to do
• Protecting sleep and daily rhythm, and reducing alcohol and drug use
• Psychotherapy and family involvement where helpful

Many people find a short list of their own warning signs, such as sleeping two hours less or feeling unusually social, is the most useful tool they own. See bipolar triggers and relapse warning signs.

At Willow & Stone

Willow & Stone provides outpatient, scheduled care and is not an emergency service. Dr. Stacey Forbes, PMHNP-BC, can evaluate, diagnose and manage bipolar I for people ages 10 and up, in Arlington or by telehealth; medication options are discussed at your evaluation. Read more about bipolar disorder treatment at Willow & Stone.

Common Questions

Sources & Further Reading

• NIMH: Bipolar Disorder (NIH Pub. 25-MH-8088, revised 2025)
• VA/DoD Clinical Practice Guideline for the Management of Bipolar Disorder (2023)
• Merck Manual Professional: Bipolar Disorders (Coryell, 2026)
• NICE CG185: Bipolar disorder assessment and management (updated 2 Sept 2025)
• Yatham et al. CANMAT and ISBD 2018 guidelines for bipolar disorder (Bipolar Disord 2018)
• Frank et al. IPSRT in bipolar I disorder (Arch Gen Psychiatry 2005)

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.