Being “polar,” or more precisely bipolar, means living with a mental health condition that causes dramatic shifts between two opposite mood states: periods of extreme emotional highs (mania) and crushing lows (depression). About 1 in 200 people worldwide, roughly 37 million, have bipolar disorder. It’s not the same as ordinary mood swings. The shifts are intense enough to disrupt sleep, thinking, energy levels, and the ability to function in daily life.
What Mania Actually Looks Like
Mania is the “up” side of bipolar disorder, but it’s not simply feeling happy. It’s an over-the-top level of energy, activity, or mood that other people can clearly notice. During a manic episode, you might sleep very little yet feel wired, talk rapidly, jump between racing thoughts, and take on ambitious projects with an inflated sense of what you can accomplish. You might feel invincible, spending money you don’t have or making impulsive decisions that seem perfectly logical in the moment.
A classic example: becoming absolutely convinced you’re going to launch a million-dollar business, pouring sleepless nights into it, despite having no experience, no plan, and no funding. The key distinction from normal enthusiasm is the intensity and duration. A manic episode lasts at least seven days (or any length if it’s severe enough to require hospitalization) and persists most of the day, nearly every day.
Not all highs reach that level. Hypomania is a milder version that lasts at least four days and involves similar symptoms, like increased talkativeness, less need for sleep, and elevated mood, but doesn’t cause the severe disruption to your work or relationships that full mania does. Hypomania also doesn’t involve psychotic symptoms like false beliefs or hallucinations, which can sometimes accompany mania.
What the Depressive Side Feels Like
The other pole is depression, and it goes well beyond feeling sad. During a depressive episode, which typically lasts at least two weeks, you might feel slowed down to the point where even simple tasks feel impossible. Concentrating becomes difficult. You may lose interest in nearly everything, including activities you normally enjoy. Appetite can swing in either direction. Sleep patterns often break down.
People in a bipolar depressive episode often describe feeling worthless or hopeless, talking very slowly, or struggling to find words. Some experience thoughts of death or suicide. These episodes can be particularly dangerous because the contrast with a recent manic high makes the low feel even more crushing. Maintaining work responsibilities, friendships, and family relationships becomes a real struggle during these stretches.
The Different Types of Bipolar Disorder
Bipolar I is defined by at least one full manic episode. Depressive episodes usually occur too, but they aren’t required for the diagnosis. This is the form most people picture when they hear “bipolar,” involving the most severe highs.
Bipolar II involves hypomanic episodes (the milder highs) paired with major depressive episodes. People with Bipolar II never experience full-blown mania, but the depressive episodes can be just as debilitating. It’s a common misconception that Bipolar II is a “lesser” form of the disorder. The depression in Bipolar II is often more frequent and longer-lasting.
There’s also a less well-known form called cyclothymic disorder, which involves chronic fluctuating moods with periods of hypomanic and depressive symptoms that don’t meet the full criteria for either a manic or major depressive episode. It’s milder but persistent, often lasting years.
Mixed Episodes: Both Poles at Once
One of the most confusing aspects of bipolar disorder is that manic and depressive symptoms can show up at the same time. You might feel wired with racing thoughts and increased energy while simultaneously experiencing deep sadness, hopelessness, or guilt. This combination, called “mixed features,” is more common than many people realize. During a manic episode with mixed features, you’d have at least three depressive symptoms like fatigue, feelings of worthlessness, or loss of interest alongside the mania. The reverse also happens: a depressive episode can include manic symptoms like racing thoughts, pressured speech, or bursts of goal-directed energy.
Mixed episodes can be especially distressing because the combination of high energy and dark mood creates a volatile emotional state.
What Causes It
Bipolar disorder has strong roots in brain chemistry and genetics. The brain’s signaling chemicals play a central role. Dopamine, the chemical involved in motivation and reward, appears to be overactive during manic episodes and underactive during depression. This imbalance in dopamine activity is thought to be a key driver behind the swing from one mood state to the other. The brain’s calming chemical, GABA, is also affected, particularly in regions that regulate mood like the prefrontal cortex and the structures deep in the brain that process emotions.
Genetics are a major factor. If you have a parent or sibling with bipolar disorder, your risk is roughly 10 times higher than someone in the general population. Among siblings specifically, the risk runs between 5 and 10 percent. For identical twins, when one twin has bipolar disorder, the other has greater than a 50 percent chance of developing it too. That said, genes aren’t destiny. Environmental factors like major life stress, sleep disruption, and substance use can trigger episodes in someone who’s genetically predisposed.
How It Gets Diagnosed
There’s no blood test or brain scan for bipolar disorder. Diagnosis starts with a clinical interview where a mental health professional takes a thorough history of your moods, behavior, sleep, energy, and functioning over time. They’ll want to know about both highs and lows, how long they lasted, and how severely they affected your life. Family history matters a great deal given the genetic component, and clinicians often ask to speak with a family member or close friend, since many people with bipolar disorder lack full insight into their own manic symptoms.
Screening tools like the Mood Disorder Questionnaire can help flag the condition. It’s a short self-report form with 13 items about mood-related symptoms. Endorsing seven or more items, confirming that multiple symptoms occurred at the same time, and rating the resulting functional impairment as moderate to severe is considered a positive screen. But the questionnaire alone doesn’t establish a diagnosis. It works alongside the clinical interview to build a complete picture. The clinician will also rule out other conditions that can mimic bipolar symptoms, including thyroid disorders, substance use, and other psychiatric conditions.
Bipolar disorder is frequently misdiagnosed as regular depression, especially when someone seeks help during a depressive episode and doesn’t mention (or doesn’t recognize) past hypomanic or manic episodes. This is why a detailed history going back years is so important.
How It’s Managed
Lithium remains the gold standard for bipolar disorder treatment and has been used for decades. It works across multiple phases of the illness: it’s effective for treating active manic episodes and for preventing future ones. Its ability to prevent depressive episodes is less clear, and it typically works better for the manic side of the equation. Lithium requires regular monitoring through blood tests because the effective dose and the dose that causes side effects are relatively close together.
Other medications used alongside or instead of lithium include certain anti-seizure medications that stabilize mood, and some medications originally developed for psychosis that also work well as mood stabilizers. Different medications have different strengths. For example, some are better at preventing depressive episodes while lithium is stronger at preventing manic ones. Finding the right combination often takes time and adjustment.
Medication is typically a long-term commitment. Bipolar disorder is a chronic condition, and stopping medication during a stable period is one of the most common triggers for relapse. Therapy, particularly types focused on recognizing early warning signs and maintaining consistent daily routines (especially sleep), plays an important supporting role. Many people with bipolar disorder live full, productive lives with the right treatment plan, but it requires ongoing attention and partnership with a care team.