Bipolar Disorder: The Complete Guide

Bipolar disorder is a long-term mood condition in which a person has episodes of mania or hypomania, meaning stretches of unusually high, expansive or irritable mood with a surge in energy, and, for most people, episodes of depression. Between episodes, many people feel like themselves again. It usually begins in late adolescence or early adulthood, it does not fade on its own, and it responds well to steady treatment. This guide covers the types, the symptoms, what is known about causes, how diagnosis works and how treatment is organized, with a link to a deeper page on each topic.

What bipolar disorder is

Bipolar disorder is a mood disorder built around distinct episodes. In one direction are manic or hypomanic episodes, when mood runs high or irritable and energy and activity climb. In the other are depressive episodes. The National Institute of Mental Health (NIMH) describes the illness as either episodic, with clear periods of wellness in between, or chronic, with symptoms that persist or keep returning. You may still hear the older names “manic depression” and “manic-depressive disorder.”

The word “episode” is what separates bipolar disorder from ordinary ups and downs. An episode is a change from the person’s usual self that lasts days or weeks, that the people around them can see, and that affects sleep, judgment, work or relationships. Feeling great after a good week is not hypomania. Four days of needing almost no sleep while starting five projects and spending money you do not have might be.

Symptoms most often start in late adolescence or early adulthood, and the American Psychiatric Association (APA) puts the average age of onset in the mid-20s. According to NIMH, based on national survey data collected in 2001–2003, about 4.4% of U.S. adults have bipolar disorder at some point in their lives, and 82.9% of adults who had it in the past year had serious impairment, the highest share of any mood disorder in that survey. Those figures are two decades old and are not a current count; our page on bipolar disorder statistics explains what the numbers can and cannot tell you.

Bipolar disorder is a health condition, not a character flaw or a personality type. NIMH notes that it usually needs long-term treatment and that proper treatment improves day-to-day functioning and quality of life.

The types of bipolar disorder

In the United States, clinicians use the DSM-5-TR diagnostic manual to name the type. The type depends on which kinds of episodes a person has had across their whole life, not on how they feel today. That is why someone who is depressed right now can still have bipolar I disorder.

Bipolar II is sometimes called the “milder” form. That label misleads: hypomania is less intense than mania, but the depressive side of bipolar II can be long and disabling. Our side-by-side comparison of bipolar I vs bipolar II walks through the differences, and there are full pages on bipolar I disorder, bipolar II disorder and cyclothymic disorder.

DSM-5 also has categories for bipolar symptoms caused by a substance or medication, or by another medical condition such as thyroid disease. You may see the phrase “bipolar spectrum” too. It is not a formal diagnosis; researchers use it to include milder, subthreshold forms. In the World Mental Health Survey across 11 countries, lifetime rates were 0.6% for bipolar I, 0.4% for bipolar II and 1.4% for subthreshold forms, about 2.4% across the whole spectrum.

Symptoms: mania, hypomania and depression

The Merck Manual summarizes the DSM-5-TR definition of a manic episode as an abnormally and persistently elevated, expansive or irritable mood, together with increased activity or energy, lasting at least a week (or any length if hospitalization is needed), plus at least three other symptoms, or four if the mood is only irritable. DSM-5 deliberately put energy and activity into the definition, not just mood. Common signs include:

• Sleeping far less than usual without feeling tired
• Talking faster or more than usual, or feeling pressure to keep talking
• Racing thoughts or jumping quickly from idea to idea
• Inflated confidence or plans that are unrealistically big
• Being easily pulled off task
• A burst of goal-directed activity, or restless, purposeless activity
• Out-of-character risks with money, sex, driving or business

Hypomania involves the same kinds of symptoms for at least four days in a row. Other people notice the change, but there is no psychosis, no marked impairment and no hospital stay. Because hypomania can feel like finally being productive and confident, it is easy to miss. Read more on what a manic episode looks like and on the signs of hypomania people overlook.

Depressive episodes last at least two weeks and bring low mood or loss of interest, along with changes in sleep and appetite, fatigue, slowed thinking, guilt, hopelessness or thoughts of death. The VA/DoD guideline points out that depression in bipolar disorder is not reliably different from depression on its own, which is why the history of highs decides the diagnosis. See bipolar depression and our existing page on telling depression and bipolar disorder apart.

For a full checklist by episode type, go to bipolar disorder symptoms and early signs. Symptoms can also look different from person to person; there are separate pages on bipolar disorder in women, bipolar disorder in men and irritability and anger.

Episode features and specifiers

Beyond the type, clinicians add short labels called specifiers that describe the current or most recent episode. They are not paperwork; several of them change which treatments are considered.

Mixed features

DSM-5 dropped the old “mixed episode,” which required full mania and full depression at once, and replaced it with a “with mixed features” label that can be added to any episode carrying symptoms of the opposite pole. For a depressive episode, that means at least three manic or hypomanic symptoms, for example feeling hopeless while your thoughts race and you cannot sleep. These states deserve close attention: one review links suicide in bipolar disorder mainly to depressed or mixed states rather than to mania. CANMAT and the International Society for Bipolar Disorders (ISBD) issued a separate 2021 update on mixed presentations. More on mixed features.

Rapid cycling

Rapid cycling means four or more mood episodes (mania, hypomania or depression) within 12 months. It does not mean moods that change from hour to hour. NIMH notes that treating depression with an antidepressant alone can trigger mania or rapid cycling. See rapid cycling bipolar disorder.

Psychotic features

Severe mania or depression can include hallucinations or delusions, which NIMH says tend to match the extreme mood: grandiose beliefs during mania, guilt-laden ones during depression. Psychosis can lead to a mistaken diagnosis of schizophrenia. Hypomania, by definition, never includes psychosis. Read psychosis in bipolar disorder and bipolar disorder vs schizophrenia.

Seasonal and peripartum patterns

NIMH notes that many people with bipolar disorder see their depression worsen in winter. Others have episodes that begin during pregnancy or in the weeks after birth, a period clinicians watch closely (see the pregnancy section below and postpartum psychosis).

Anxious distress

DSM-5 added a “with anxious distress” label for episodes that come with marked tension and worry. Anxiety is common alongside bipolar disorder: a meta-analysis of 52 studies put lifetime anxiety disorders at 42.7%. See bipolar disorder or anxiety?

What causes bipolar disorder

There is no single cause. Researchers describe bipolar disorder as the result of inherited risk, differences in how the brain is built and functions, and life experiences acting together. The old idea that it comes down to one brain chemical being “off” is too simple and is not how the science describes it today.

Genes. Bipolar disorder runs strongly in families. A twin study estimated heritability at 85%, and a Swedish population study of more than 54,000 cases estimated 58% and found that first-degree relatives had roughly 6 to 8 times the usual risk; taken together, family and twin studies put heritability at roughly 60–85%. The risk is polygenic, spread across many gene variants that each have a small effect. NIMH stresses that no one gene causes the disorder, and identical twins can differ, with one developing it and the other not.

Brain structure and function. NIMH reports that research shows the brain structure and function of people with bipolar disorder may differ from those of people without it. These are group-level research findings, not something a scan can use to diagnose one person.

Environment and triggers. Stressful life events and trauma may set off the illness in people who are already genetically at risk, according to NIMH. Lost sleep, substance use and some medications can tip someone into an episode. A 2026 meta-analysis of 19 long-term studies found cannabis use associated with later bipolar disorder (relative risk 2.46), an association rather than proof of cause. Thyroid disease and some prescribed or recreational drugs can mimic or worsen mood symptoms.

Go deeper with what causes bipolar disorder, common triggers and relapse warning signs and bipolar disorder and substance use. Genetic testing cannot diagnose or predict bipolar disorder; what pharmacogenomic tests can and cannot add is covered in pharmacogenomic testing in bipolar disorder.

How bipolar disorder is diagnosed

Bipolar disorder is diagnosed by a trained clinician from a careful history, not from a lab result. NIMH is plain about it: no blood test or brain scan can diagnose the condition. Tests are used to rule out other causes, such as thyroid disease or the effects of a substance.

A thorough evaluation usually covers:

• A timeline of past highs and lows, including how long each lasted and what sleep looked like
• How you responded to any antidepressant you have taken
• Family history of bipolar disorder, depression, suicide and substance use, across generations
• Alcohol, cannabis, other drugs and prescribed medications
• Medical conditions, with labs ordered as needed to rule out mimics
• With your permission, the view of someone who knew you during an episode

Questionnaires such as the Mood Disorder Questionnaire (MDQ) are screening tools. The VA/DoD guideline suggests using validated tools in specialty care to support a diagnostic decision, not to make it, and NICE advises against using questionnaires to identify bipolar disorder in primary care. A 2019 meta-analysis found the MDQ flags about 80% of people who have bipolar disorder but also flags many who do not. Our bipolar self-check is labeled for exactly that reason, and screening vs diagnosis explains the difference.

Getting to the right answer often takes time. A meta-analysis of 27 studies found a pooled delay of 5.8 years from onset to treatment, and in one survey of people with bipolar disorder, 69% had first been given a different diagnosis, most often depression. Read how bipolar disorder is diagnosed, lab work in bipolar care and getting a second opinion. At Willow & Stone, this work happens in an integrative psychiatric evaluation.

Conditions that can look like bipolar disorder

NICE asks clinicians to consider schizophrenia-spectrum disorders, personality disorders, drug and alcohol misuse, ADHD, and an over- or underactive thyroid before settling on bipolar disorder. Several of these also occur alongside it, which is part of what makes diagnosis hard. In research samples, about 1 in 6 adults with bipolar disorder also has ADHD, about 1 in 5 has borderline personality disorder, and alcohol use disorder appears in 42% of clinical samples.

The most useful question is usually whether symptoms come in episodes (a clear change lasting days or weeks, then a return to baseline) or whether they are steady traits or reactions that come and go within hours. Each comparison has its own page:

• Depression or bipolar disorder: the most common mix-up, because people seek help when they are low
• Bipolar disorder vs ADHD: lifelong attention problems versus episodes
• Bipolar disorder vs borderline personality disorder: mood episodes versus a pattern of relationships and identity
• Bipolar disorder or anxiety: agitation and poor sleep driven by worry
• Bipolar disorder vs schizophrenia: whether psychosis happens only during mood episodes
• Medical conditions that mimic mental illness, including thyroid problems and medication effects

Treatment phases: acute, continuation and maintenance

Bipolar treatment is planned over time, not just for the episode in front of you. The CANMAT/ISBD 2018 guidelines and the UK’s NICE guideline CG185 (last updated 2 September 2025) organize their advice around two jobs: treating an acute episode, and long-term (maintenance) treatment to prevent the next one. Many clinicians also talk about a continuation phase in between.

Acute phase

The goal is to bring a manic, hypomanic, mixed or depressive episode under control safely. For mania, NICE advises that if someone is taking an antidepressant on its own, stopping it should be considered and an antipsychotic offered. Severe mania or psychosis may need hospital-level care, where safety can be watched around the clock.

Continuation phase

Once symptoms settle, the following months are a fragile stretch. The plan that worked usually continues, side effects are sorted out, and sleep and early warning signs are watched closely, because feeling better is not the same as being protected from a return.

Maintenance phase

Maintenance is about prevention. NIMH notes that bipolar disorder usually needs lifelong treatment, and steady treatment works better than starting and stopping. Stopping a mood stabilizer suddenly raises the risk of relapse; if a medication is ever changed or stopped, guidelines describe a gradual, supervised process. Talk with your prescriber first, and see stopping psychiatric medication safely.

When depression does not respond to standard options, NIMH notes that electroconvulsive therapy (ECT) is usually considered when other treatments have not worked or a rapid response is needed, and that transcranial magnetic stimulation (TMS) is another option. Ketamine, esketamine, TMS and ECT are not offered at Willow & Stone, and a referral is made when one of them is indicated.

Bipolar medications by class

For most people, medication is the foundation of treatment, and the choice depends on the type of bipolar disorder, the current phase, past responses, other health conditions, pregnancy plans and side effects. The guideline positions below describe what the guidelines list, not a recommendation for any individual. A full overview is on bipolar disorder medications explained.

Two newer points are worth knowing. A 2023 evidence update to the 2018 CANMAT/ISBD guidelines moved cariprazine up to a first-line option for bipolar I depression. The 2021 CANMAT/ISBD mixed-features update found that no medication met the bar for first-line treatment of episodes with mixed features, so those choices rest on second-line options and careful follow-up.

Many of these medicines need regular monitoring; see lithium levels explained, lab work in bipolar care and weight gain on bipolar medication. If depression is the main problem, treating bipolar depression covers the options. Never start, stop or change a dose yourself; route every change through the person who prescribes for you.

Psychotherapy and psychoeducation

Therapy works alongside medication rather than in place of it. The VA/DoD guideline suggests adding psychotherapy for people who are not acutely manic and names several options without ranking one above the others. NICE recommends structured individual, group or family programs designed specifically for bipolar disorder to help prevent relapse.

• Interpersonal and social rhythm therapy (IPSRT) steadies daily routines, such as wake time, meals and activity, and works on relationship stress. In a trial of 175 people with bipolar I, those who had IPSRT in the acute phase went longer without a new episode.
• Family-focused therapy (FFT) brings in family members to learn about the illness, practice calmer communication and solve problems together. NIMH says it helps adolescents and adults when started with mood-stabilizing medication after an episode.
• Cognitive behavioral therapy (CBT) works on thinking and behavior patterns; a version adapted for insomnia can help in bipolar depression.
• Psychoeducation teaches you and the people close to you how the illness behaves, which early signs to watch and what to do when they appear.

In the large STEP-BD trial of 293 outpatients with bipolar depression, intensive therapy (FFT, IPSRT or CBT, up to 30 sessions) led to recovery by year-end in 64.4% of people, compared with 51.5% of those who had three sessions of brief care. Read therapy for bipolar disorder and our guide to therapy types that pair well with medication.

Sleep, routine and everyday habits

Sleep is both an early warning light and a lever. A few nights of short sleep can come before mania, and protecting sleep is part of treatment. NIMH recommends a regular routine for sleeping, eating and exercise, and keeping a life chart or mood journal so that patterns and early changes show up before they become episodes. Our free bipolar mood chart and sleep and bipolar disorder pages show how.

NIMH also advises avoiding alcohol and drugs, which can trigger episodes and interfere with medication. Smoking is common, too; the VA/DoD guideline cites a rate of about 49% among people with bipolar disorder.

Some approaches help only under supervision. In a trial of adults with bipolar depression who were already taking anti-manic medication, midday bright light led to remission in 68.2% versus 22.2% with a dim placebo light, but people with mixed symptoms or rapid cycling were excluded. Light therapy is an add-on to be guided by a clinician, not something to start alone.

The FDA has not approved any supplement or complementary approach for bipolar disorder, and the VA/DoD guideline finds the evidence for supplements insufficient. Some can cause harm: NCCIH warns that SAMe may worsen mania and that St. John’s wort has been linked to worsening psychosis in bipolar disorder. See nutrition and bipolar disorder, supplements and bipolar disorder and living well with bipolar disorder.

Bipolar disorder in teens and children

Young people can develop bipolar disorder; NIMH calls the belief that they cannot a misperception. In NIMH’s national survey of adolescents (2001–2004 data), lifetime prevalence among 13- to 18-year-olds was 2.9%, rising with age. Diagnosis in youth is harder than in adults, though, because irritability, poor sleep and impulsive behavior have many causes, and DSM-5 created a separate diagnosis, disruptive mood dysregulation disorder (DMDD), partly because chronically irritable children were being labeled bipolar.

Medication choices also differ: FDA approvals for young people are drug-specific and age-specific, and some medicines common in adults have no pediatric approval for bipolar disorder. Parents will find all of this, plus school and safety planning, in our separate guide to bipolar disorder in teens and children.

Pregnancy and the postpartum period

Pregnancy and the months after birth deserve planning, ideally before conception. In a meta-analysis of about 5,700 deliveries, women with bipolar disorder who stayed off medication during pregnancy relapsed after birth 66% of the time, compared with 23% of those who took preventive medication. Postpartum psychosis is rare, occurring in roughly 0.89 to 2.6 of every 1,000 women in a systematic review, but people with bipolar disorder are among those at highest risk, and it is a medical emergency.

Some medications carry real pregnancy risks. The U.S. valproate label, for example, says it should not be used in pregnancy unless other medications have failed or are unacceptable. That is a reason to plan with your prescriber, not to stop a medication on your own. Read bipolar disorder, pregnancy and postpartum for the planning side and psychiatric medication in pregnancy for drug-by-drug detail.

Outlook over the long term

There is no cure for bipolar disorder, but it is very treatable, and many people stay well for long stretches with ongoing treatment, building careers, relationships and families. Outcomes are best when treatment is steady, when sleep and routine are protected, and when the person and their family know their early warning signs.

Untreated or undertreated, the illness carries serious risks. The VA/DoD guideline cites research linking bipolar disorder to roughly 10 years of potential life lost, much of it from heart disease and other physical conditions as well as suicide. One review put the suicide rate at roughly 20–30 times that of the general population. Treatment changes that picture: NIMH notes that lithium can lower the risk of suicide, and many studies associate it with fewer suicide deaths.

More on the risks of untreated bipolar disorder, and on high-functioning bipolar disorder, where symptoms are easy to hide and easy to dismiss.

When it is an emergency

Some situations need help today, not at the next appointment. Call 911 or go to the nearest emergency room if someone:

• Talks about suicide with a plan, or has harmed themselves
• Is seeing or hearing things others do not, or holds beliefs that put them in danger
• Has barely slept for several nights and their behavior is escalating
• Is driving, spending or acting in ways that could cause serious harm
• Cannot eat, drink or care for themselves

For urgent support at any hour, call or text 988, or chat at 988lifeline.org, to reach the 988 Suicide & Crisis Lifeline. You can also text HOME to 741741 for the Crisis Text Line. Willow & Stone provides outpatient, scheduled care and is not an emergency service. If a higher level of care is needed (for example during severe mania or psychosis), we help you find it.

Getting evaluated and treated

If parts of this guide sound familiar, the next step is a full evaluation rather than another online quiz. At Willow & Stone, Dr. Stacey Forbes, DNP, APRN, PMHNP-BC, a board-certified psychiatric-mental health nurse practitioner, evaluates, diagnoses and treats bipolar I and bipolar II for patients 10 and older, in person in Arlington, Texas, and by telehealth in Texas, New Mexico, Florida, Alaska, Arizona, Colorado and Washington (you need to be in one of those states at the time of the visit). Medication options are discussed at your evaluation, and labs are ordered as needed. Learn what care involves on our page about bipolar disorder treatment at Willow & Stone.

Where to next: every page in this guide

Types and symptoms

Episodes and specifiers

Causes, triggers and living well

Women, men, anger and pregnancy

Diagnosis and look-alikes

Medication

Therapy, sleep, nutrition and substances

Treatment at Willow & Stone

Signs and diagnosis in young people

Treatment, family and school

For parents: Bipolar Disorder in Teens and Children, with its own pages on teen symptoms, DMDD, school support and treatment.

Common Questions

Sources & Further Reading

• NIMH: Bipolar Disorder (NIH Pub. No. 25-MH-8088, revised 2025)
• NIMH: Bipolar Disorder statistics (NCS-R/NCS-A survey data)
• American Psychiatric Association: What Are Bipolar Disorders?
• Merck Manual Professional: Bipolar Disorders (reviewed 2026)
• NICE CG185: Bipolar disorder, assessment and management (updated 2 Sept 2025)
• VA/DoD Clinical Practice Guideline: Management of Bipolar Disorder (2023)
• Yatham et al. CANMAT and ISBD 2018 guidelines for bipolar disorder. Bipolar Disord 2018
• Yatham et al. CANMAT/ISBD 2021 update on mixed presentations. Bipolar Disord 2021
• Keramatian, Chithra & Yatham. CANMAT/ISBD guidelines: a 2023 update of evidence. Focus 2023
• Miklowitz et al. Intensive psychosocial intervention for bipolar depression (STEP-BD). Arch Gen Psychiatry 2007

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.