Key Takeaways
- Bipolar disorder is recognized by episodes: stretches of days or weeks that look clearly different from how the person usually is.
- There are three kinds of episode to know: manic, hypomanic and major depressive. Each has its own minimum length.
- A change in energy and activity, not just mood, is central to mania and hypomania, and less need for sleep is one of the clearest signs.
- Friends and family often notice an elevated period before the person does, so their view is part of a good assessment.
- No blood test or scan can diagnose bipolar disorder; a clinician pieces it together from history over time.
Bipolar disorder symptoms come in episodes rather than as a constant personality trait. During a manic or hypomanic episode a person has more energy, needs less sleep, talks and thinks faster and may take risks they normally wouldn't. During a depressive episode the opposite happens: low mood or loss of interest, fatigue, and slowed thinking that lasts at least two weeks. What makes it bipolar disorder is the pattern over time, not one bad day. Below is a checklist by episode type, the timing rules clinicians use, and signs that it's time to book an evaluation.
Episodes, not moods: how to think about the symptoms
Everyone has ups and downs. The symptoms of bipolar disorder are different in two ways: they cluster together into an episode that lasts a set number of days, and they represent a clear change from the person's usual self. The American Psychiatric Association (APA) describes the behavior changes during mania as "clear to friends and family," which is a useful test: the shift is visible, not just a feeling.
When the APA revised its diagnostic manual (DSM-5), it put more weight on changes in activity and energy, not only mood. So a person who is unusually busy, driven and restless can meet the first criterion even if they wouldn't call themselves happy. Mood during these periods can be euphoric, expansive or simply irritable.
NIMH describes bipolar disorder as either episodic, with clear breaks between episodes, or more chronic, with symptoms that persist or keep returning. Many people also have stretches of normal mood between episodes. For an overview of the whole condition, see our complete guide to bipolar disorder.
Checklist: symptoms of a manic or hypomanic episode
Mania and hypomania share the same list of symptoms. They differ in how long they last and how much damage they do. Common signs, drawn from NIMH and APA descriptions:
- Feeling unusually "up," wired, or irritable and short-tempered for days at a time
- Needing much less sleep and not feeling tired (different from insomnia, where people want to sleep and can't)
- Talking faster or more than usual; others find it hard to get a word in
- Racing thoughts or jumping quickly from one idea to the next
- Inflated confidence or a sense of special ability or importance
- Taking on many projects at once, or being unable to sit still
- Being easily distracted
- Risky or impulsive choices: spending, driving, sex, business decisions, substances
A clinician looks for the core change in mood and energy plus at least three of these (four if the mood is only irritable), according to the Merck Manual summary of the criteria. Full mania can include psychosis, such as false beliefs or hearing things, and NIMH notes these symptoms tend to match the extreme mood. For the episode itself in detail, read what a manic episode looks like; for the milder form, see hypomania and the signs people miss.
Checklist: symptoms of a depressive episode
Depressive episodes in bipolar disorder use the same criteria as major depression and last at least two weeks. Signs include:
- Persistent sadness, emptiness or hopelessness, or loss of interest in things that used to matter
- Fatigue and slowed movement or speech
- Sleeping much more, or much less, than usual
- Changes in appetite or weight
- Trouble concentrating or making decisions
- Feelings of worthlessness or guilt
- Thoughts of death or suicide
Because these look the same as depression on its own, a person who seeks help only when low may be treated for depression for years. That question is covered on is it depression or bipolar disorder?, and the bipolar-specific picture on bipolar depression.
Some episodes mix the two poles, for example feeling hopeless while also racing, restless and unable to sleep. DSM-5 calls this an episode "with mixed features." It needs prompt attention; see mixed features in bipolar disorder.
The timing rules, in plain language
Length matters as much as the symptoms. These are the thresholds most U.S. clinicians use, summarized from the APA, the Merck Manual and the 2023 VA/DoD guideline:
| Pattern | Minimum length | What else has to be true |
|---|---|---|
| Manic episode | At least 1 week, or any length if hospital care is needed | Clear change in mood and energy plus 3 or more symptoms (4 if mood is only irritable); causes marked problems or psychosis |
| Hypomanic episode | At least 4 days in a row | Same kinds of symptoms, noticeable to others, but no psychosis, no marked impairment, no hospitalization |
| Major depressive episode | At least 2 weeks | Low mood or loss of interest plus other depressive symptoms most of the day, nearly every day |
| Cyclothymic pattern | 2 years in adults, 1 year in children and teens | Frequent ups and downs that never reach a full episode |
| Rapid cycling | 4 or more episodes in 12 months | A specifier added to bipolar I or II, not a separate type |
These rules decide the type: at least one manic episode means bipolar I; hypomania plus major depression, with no mania ever, means bipolar II. Our page on bipolar I vs bipolar II lays the differences side by side, and cyclothymic disorder covers the milder, longer-running form.
How symptoms look from the inside versus the outside
One reason bipolar disorder is missed is that the person and the people around them often experience the same week very differently. An elevated period may feel like finally being yourself.
| What the person may experience | What a partner, parent or coworker may see |
|---|---|
| "I have so many good ideas and so much energy." | Several new plans started in a few days, none finished |
| "I don't need much sleep right now." | Lights on at 3 a.m., texts sent overnight |
| "Everyone else is just slow." | Interrupting, talking over people, snapping when slowed down |
| "I deserve this." | Unusual purchases, a sudden trip, a risky deal |
| "I'm tired of everything." | Withdrawing, missing work, staying in bed for days |
If you are reading this about someone you love, write down dates and examples. If you are reading this about yourself, consider asking someone close to you whether they have noticed periods when you seemed different. A clinician will often ask permission to hear from them.
Early signs and when symptoms usually begin
NIMH says symptoms most often start in late adolescence or early adulthood, and the APA puts the average age of onset in the mid-20s. Children occasionally have symptoms too. In young people the signs can include long periods of silliness or intense happiness, a very short temper, fast talk and sleeping little without seeming tired; parents can learn more in our guide to bipolar disorder in teens and children.
Early warning signs often recur in the same order for a given person. Commonly reported ones are sleeping less, feeling more talkative, taking on extra commitments, or, before a low, pulling back and sleeping more. Learning your own pattern is one of the most practical tools in long-term care.
Things that can look like bipolar disorder
Several conditions share symptoms with bipolar disorder, so a careful evaluation checks for them:
- Thyroid disease and some prescribed, recreational or illicit drugs can mimic or worsen mood symptoms (NIMH). Corticosteroids and stimulants are examples clinicians ask about.
- ADHD, anxiety disorders and substance use often occur alongside bipolar disorder and overlap with it.
- Borderline personality disorder involves mood shifts that usually last minutes to hours and follow triggers, rather than episodes lasting days.
- Psychotic symptoms during mania can lead to a mistaken schizophrenia diagnosis (NIMH).
NIMH is clear that no blood test or brain scan can diagnose bipolar disorder; tests are used to rule out other causes. A self-screener such as our bipolar self-check can help you organize what you have noticed, but it is screening, not a diagnosis.
When to book an evaluation, and when to get help now
Get emergency help now if
Book an evaluation if you recognize a pattern of distinct high-energy periods alongside depression, if an antidepressant ever made you feel revved up, agitated or unable to sleep, or if bipolar disorder runs in your family and your mood has been changing in episodes. Bring dates, a medication list and, if possible, a family history.
At Willow & Stone, Dr. Stacey Forbes, a board-certified psychiatric-mental health nurse practitioner, evaluates mood symptoms in a 90-minute first visit, in Arlington, Texas or by telehealth. Learn more about bipolar disorder treatment at Willow & Stone.
Common Questions
What are the early signs of bipolar disorder?
Early signs are often a change in sleep and energy: needing less sleep without feeling tired, talking faster, starting many projects, or becoming unusually irritable. Before a low, people may withdraw and sleep more. Symptoms usually begin in late adolescence or early adulthood, according to NIMH.
What does a bipolar episode look like?
A manic or hypomanic episode is a run of days with raised or irritable mood, more energy and activity, less need for sleep, fast speech and impulsive choices. A depressive episode lasts at least two weeks with low mood or lost interest, fatigue and hopelessness. Both are a clear change from the person's usual self.
How long does a bipolar episode last?
By definition a manic episode lasts at least a week (or any length if hospital care is needed), hypomania at least four days in a row, and a depressive episode at least two weeks. Actual episodes vary widely from person to person and are often longer.
Can you have bipolar disorder without mania?
Yes, in the sense that bipolar II involves hypomania rather than full mania. But some form of elevated episode is needed for the diagnosis. Depression alone, however severe, is not bipolar disorder, though a family history may prompt closer follow-up.
Are mood swings a sign of bipolar disorder?
Not usually on their own. Mood shifts within a day, or in response to events, are common and have many causes. Bipolar episodes last days to weeks and come with changes in sleep, energy and behavior that other people notice.
Can a blood test show bipolar disorder?
No. NIMH states that no blood test or brain scan can diagnose bipolar disorder. Labs such as thyroid tests may be ordered to rule out other causes, and the diagnosis rests on a careful history over time.
Part of our bipolar disorder guide
Sources & Further Reading
- NIMH: Bipolar Disorder (NIH Pub. 25-MH-8088, revised 2025)
- American Psychiatric Association: What Are Bipolar Disorders?
- Merck Manual Professional: Bipolar Disorders (Coryell, 2026)
- VA/DoD Clinical Practice Guideline for the Management of Bipolar Disorder (2023)
- NIMH: Bipolar Disorder in Children and Teens (2023)
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.
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