Bipolar 1 Disorder and Bipolar 2 Disorder: What Are the Differences?

Understanding bipolar disorder


  1. If you have bipolar disorder, your feelings can reach abnormally high or low levels.
  2. You must have had at least one manic episode and one major depressive episode for your doctor to diagnose you with bipolar 1 disorder.
  3. Bipolar 2 disorder involves a major depressive episode lasting at least two weeks and at least one hypomanic episode.

It’s fairly typical to experience emotional ups and downs. These often depend on what’s going on in your life. Gorgeous weather on a day you planned to be outdoors may make you feel appreciative. Not getting an expected raise at work may lead you to feel angry or frustrated. These responses are generally temporary. This can allow you to live in a relatively calm state most of the time.

If you have bipolar disorder, your feelings can reach abnormally high or low levels. One moment you may be immensely excited or energetic. You may then find yourself sinking into the depths of depression. Some of these emotional peaks and valleys can last for weeks or months. Others may disappear within a few hours. Bipolar disorder is a brain condition that can interfere with daily activities, employment, and relationships. It can affect your overall quality of life.

Bipolar disorder is characterized by episodes of extreme highs and extreme lows. The highs are known as manic episodes. The lows are known as depressive episodes. You may have a handful of such episodes a year, or you may have several within a week. Some people with bipolar disorder may have a manic episode and a depressive episode in the same day. People who experience such rapid shifts are said to have “rapid cycling.”

Two types of this condition are bipolar 1 disorder or bipolar 2 disorder. There are other types of bipolar disorder, but this article will focus on these two types. Bipolar 1 and bipolar 2 disorder involve highs and lows beyond what would otherwise be considered healthy. The differences lie in how manic or how depressed you are during an episode.



What are the symptoms of bipolar disorder?

The symptoms will vary based on the type of bipolar disorder that you may have.


A manic episode is more than just a feeling of elation, high energy, or being distracted. During a manic episode, the mania is so intense that it can interfere with your daily activities. It’s difficult to redirect someone in a manic episode toward a calmer, more reasonable state. People who are in the manic phase of the illness can make some very irrational decisions, such as spending large amounts of money that they can’t afford to spend. They may also engage in high-risk behaviors, such as sexual indiscretions despite being in a committed relationship.

An episode can’t be officially deemed manic if it’s caused by outside influences. This includes alcohol, drugs, or another health condition.


Though less severe than a manic episode, a hypomanic phase is still an event in which your behavior differs from your normal state. The differences will be extreme enough that people around you may notice that something is wrong.

Officially, a hypomanic episode isn’t considered hypomania if it’s influenced by drugs or alcohol.

Learn more: How to recognize and treat bipolar disorder in teens »


Depressive symptoms in someone with bipolar disorder are like those of someone with clinical depression. They may include extended periods of sadness and hopelessness. You may also experience a loss of interest people you once enjoyed spending time with and activities you used to like. Other symptoms include:

  • tiredness
  • irritability
  • difficulty concentrating.
  • changes in sleeping habits
  • changes in eating habits often change
  • thoughts of suicide

Bipolar 1 disorder

What is bipolar 1 disorder?

You must have had at least one manic episode and one major depressive episode to be diagnosed with bipolar 1 disorder. The depressive episode must have occurred either before or after the manic episode. The symptoms of a manic episode may be so severe that you require hospital care.

Manic episodes are usually characterized by the following:

  • exceptional energy
  • restlessness
  • difficulty concentrating
  • feelings of euphoria
  • risky behaviors
  • poor sleep

The symptoms of a manic episode tend to be so obvious and intrusive that there’s little doubt that something is wrong.


Bipolar 2 disorder

What is bipolar 2 disorder?

Bipolar 2 disorder involves a major depressive episode lasting at least two weeks and at least one hypomanic episode. People with bipolar 2 typically don’t experience manic episodes intense enough to require hospitalization.

Bipolar 2 is sometimes misdiagnosed as depression. When there are no manic episodes to suggest bipolar disorder, the depressive symptoms become the focus.


What causes bipolar disorder?

Scientists don’t know what causes bipolar disorder. Abnormal physical characteristics of the brain or an imbalance in certain brain chemicals may be among the main causes.

As with many medical conditions, bipolar disorder tends to run in families. If you have a parent or sibling with bipolar disorder, your risk of developing it is higher. The search continues for the genes responsible for bipolar disorder.

Researchers also believe that severe stress, drug or alcohol abuse, or severely upsetting experiences may trigger bipolar disorder. These experiences can include childhood abuse or the death of a loved one.



How is bipolar disorder diagnosed?

A psychiatrist or other mental health professional typically diagnoses bipolar disorder. The diagnosis will include a review of your medical history, as well as of any symptoms you have that are related to mania and depression. A trained professional will know what questions to ask. It can be very helpful to bring a spouse or close friend with you during the doctor’s visit. They may be able to answer questions about your behavior that you may not be able to answer easily or accurately.

If you have symptoms that seem like bipolar 1 or bipolar 2, you can always start by telling your doctor. Your doctor may refer you to a mental health specialist if your symptoms appear serious enough.

A blood test may also be part of the diagnostic process. There are no markers for bipolar disorder in the blood, but a blood test and a comprehensive physical exam may help rule out other possible causes for your behavior.



How is bipolar disorder treated?

Doctors usually treat bipolar disorder with a combination of medications and psychotherapy.

Mood stabilizers are often the first drugs used in treatment. You may take these for a long time. Lithium has been a widely used mood stabilizer for many years. It does have several potential side effects. These include low thyroid function, joint pain, and indigestion. Antipsychotics can be used to treat manic episodes.

Your doctor may start you on a low dose of medication to see how you respond. You may need a stronger dose than what they initially prescribe. You may also need a combination of drugs to control your symptoms. All medications have potential side effects and interactions with other drugs. If you’re pregnant or you take other medications, be sure to tell your doctor before taking any new medications.

Writing in a diary can be an especially helpful part of your treatment. Keeping track of your moods, sleeping and eating patterns and significant life events, can help you and your doctor understand how therapy and medications are working. If your symptoms don’t improve or get worse, your doctor may order a change in your medications or a different type of psychotherapy.

Learn more: Bipolar disorder: A guide to therapy »



What is the outlook?

Bipolar disorder isn’t curable. With proper treatment and support from family and friends, you can manage your symptoms and maintain your quality of life.

It’s important that you follow your doctor’s instructions regarding medications and other lifestyle choices. This includes:

  • alcohol use
  • drug use
  • exercise
  • diet
  • sleep
  • stress reduction

Including your friends and family members in your care can be especially helpful.

It’s also helpful to learn as much as you can about bipolar disorder. The more you know about the condition, the more in control you may feel as you adjust to life after diagnosis. You may be able to repair strained relationships. Educating others about bipolar disorder may make them more understanding of hurtful events from the past.


Support options

Support groups, both online and in person, can be helpful for people with bipolar disorder. It can also be beneficial for your friends and relatives. Learning about others’ struggles and triumphs may help you get through any challenges you may have.

The Depression and Bipolar Support Alliance maintains a website that provides:

  • personal stories from people with bipolar disorder
  • contact information for support groups across the United States
  • information about the condition and treatments
  • material for caregivers and loved ones of those with bipolar disorder

The National Alliance on Mental Illness can also help you find support groups in your area. Good information about bipolar disorder and other conditions can also be found on its website.

If you’ve been diagnosed with bipolar 1 or bipolar 2, you should always remember that this is a condition you can manage. You aren’t alone. Talk to your doctor or call a local hospital to find out about support groups or other local resources. 

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