Good weeks and bad weeks are part of being human. Mood moves with sleep, stress, news and the seasons. The National Institute of Mental Health (NIMH) puts it simply: everyone has ups and downs, but with bipolar disorder the range of mood changes can be extreme. What sets it apart is the size of the swings, how long they last and how often they come back, which are the same things NIMH says clinicians weigh when making a diagnosis.
What an "up" episode looks like
NIMH describes manic episodes with signs such as feeling very high, elated or extremely irritable, racing thoughts, a decreased need for sleep, talking fast about many different things, and feeling unusually important, talented or powerful. Hypomania is a lighter version of the same pattern. Because a hypomanic stretch can feel like a burst of productivity, it is easy for the person living it to overlook.
A bad afternoon is not an episode
Length is one of the clearest dividing lines. NIMH says mood episodes bring symptoms that last a week or two, sometimes longer, and that during an episode the symptoms are present every day for most of the day. A mood that flips several times in one afternoon after an argument is a different thing.
The main types
- Bipolar I disorder: NIMH describes it by manic episodes that last at least 7 days, most of the day, nearly every day.
- Bipolar II disorder: a pattern of depressive episodes and hypomanic episodes, which are less severe than mania.
- Cyclothymic disorder: hypomanic and depressive symptoms that keep returning but are not intense enough, or do not last long enough, to count as full episodes.
All three are DSM-5-TR diagnoses, and a qualified clinician makes them after a full evaluation.
Why it is often first treated as depression
Many people reach out during a low stretch, not during a high one. NIMH notes that people with bipolar II disorder may seek help only for depressive episodes, so hypomanic episodes may go unnoticed. If you have been treated for depression and you have ever had a run of far more energy, much less sleep and faster thoughts than usual, say so at your next visit.
When it usually starts
Most of the time, NIMH says, symptoms begin in late adolescence or early adulthood. An adult looking back may find the first signs years earlier.
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How a clinician sorts it out
NIMH says a diagnosis rests on the severity, length and frequency of symptoms. A provider may suggest a physical exam or medical tests to rule out other illnesses. Keeping a mood journal or life chart, as NIMH recommends, gives your provider a clearer timeline than memory alone.
What helps
Mental health professionals treat bipolar disorder with medication, psychotherapy or a combination, according to NIMH. The talk therapies it names include cognitive behavioral therapy, family-focused therapy, and interpersonal and social rhythm therapy. Medication when indicated is decided jointly with the patient. NIMH also suggests a steady routine for eating, sleeping and exercise, and avoiding alcohol and drugs. Its topic page adds that bipolar disorder usually requires lifelong treatment.
Getting evaluated
We evaluate mood changes and care for bipolar disorder in West Ashley and by secure video anywhere in South Carolina, with medication management and counseling as part of the plan. Request an appointment.
Sources: NIMH, Bipolar Disorder (revised 2025); NIMH, Bipolar Disorder topic page (reviewed December 2024); American Psychiatric Association, DSM-5-TR (bipolar I disorder, bipolar II disorder, cyclothymic disorder).
This article is general information, not medical advice, and does not create a patient–provider relationship. Every situation is different, so see a provider who can evaluate yours and develop a plan of care. Any medication discussed here may not be right for you: the right choice depends on your diagnoses, other health conditions and current medicines, so take medication only as directed by the provider managing your care. If you are ever in doubt about an emergency, call 911 or go to the nearest emergency room.
Frequently Asked Questions
Ordinary mood swings come and go. In bipolar disorder, NIMH says, mood episodes last a week or two or longer, with symptoms most of the day, and the changes can be extreme. A qualified clinician can look at your history and tell the difference.
NIMH describes hypomania as like mania but less severe. It can bring more energy, less need for sleep and racing thoughts, and because it can feel productive it often goes unnoticed.
Yes. NIMH says people with bipolar II disorder may seek help only for depressive episodes, so hypomanic episodes may go unnoticed.
Most often in late adolescence or early adulthood, according to NIMH.