What Is Bipolar II Disorder? - Symptoms, Diagnosis & Treatment

Instructor: Devin Kowalczyk

Devin has taught psychology and has a master's degree in clinical forensic psychology. He is working on his PhD.

What is the difference between Bipolar I Disorder and Bipolar II Disorder? The symptoms, while similar, manifest with a different intensity, kind of like the difference between a party popper and a firework.

Bipolar I Disorder is very similar to Bipolar II, but possesses subtle differences to make it a different diagnosis. The main difference, as will be explored below, is the different levels of mania the two endure.

Mood Disorder

Bipolar II Disorder is considered a mood disorder. Mood disorders obviously have to do with a person's mood. One of the most well-known mood disorders is Major Depression, sometimes called unipolar depression. Bipolar disorder is like having two opposite mood disorders rolled into one. They just swing back and forth.

II vs. I

Bipolar I Disorder is when a person has depression and mania. Think of it like a long pole, and at one side is super sad (depression) and the other side is super excited (mania).

Bipolar II Disorder is when a person cycles between relatively normal moods, suffering from major depressive episodes, and experiencing hypomanic episodes. The term episodes is used here to mean that the individual suffers a full range of emotions, but it is not a constant state of being. Someone can be extremely depressed, and then they can have an episode of depression. The only difference between the two versions is the level of mania. Those afflicted with Bipolar I have full mania, while those with Bipolar II have hypomania. What this means will be explored below.

Hypomanic Episode

Full mania, part of the Bipolar I Disorder, is described as being excessively filled with energy, inflated self-esteem, distractibility, and decreased need for sleep. Think of giving someone a Big Gulp filled with an energy drink, a cup of coffee, a caffeine pill, and a little amphetamine. They could be described as overflowing with energy.

Extreme Happiness

A hypomanic episode is a period of elevated, expansive, or irritable mood lasting at least four days. During this time the person must be different enough that those close to them notice. He or she must have three or more of the following symptoms which are markedly different than his or her 'normal' day-to-day mood:

  • Inflated self-esteem or grandiosity
  • Decreased need for sleep
  • More talkative than normal
  • Quickly changing ideas or thoughts seem to race ahead
  • Distractibility
  • Increase in goal-directed activities
  • Excessive focus on pleasurable activities (excessive gambling, poor investments bought in the moment, sexual promiscuity)

The main difference between hypomania and mania is hypomania does not cause a marked impairment in functioning. The person has this feeling of being full of energy for several days, without the need for medical treatment. Also, the symptoms cannot be caused by an outside source like amphetamines.

Major Depressive Episode

A depressive episode is a mood of sadness or negativity that is powerful enough to keep you from your life. This is when the person effectively shuts down and withdraws from the world.

Extreme Sadness

A person must have most of the following symptoms to some degree for two weeks, or if it was so severe it required hospitalization:

  • Depressed or sad mood, with feelings of emptiness, hopelessness, guilt, tearfulness, or occasionally irritability or physical pain
  • Inability to think clearly or concentrate
  • Loss of interest or feeling of pleasure in activities once enjoyed
  • Increase of decrease in eating, appetite, or weight
  • Change in sleep patterns, including insomnia and hypersomnia, as well as constant feelings of fatigue
  • Lethargy or slowed physical movements
  • Decreased feelings of self-worth, often paired with suicidal thoughts and actions


A licensed psychologist or psychiatrist is required to diagnose someone. The requirements, however, would be a presence of:

  • One or more major depressive episodes
  • One or more hypomanic episodes
  • The person has not had a full manic episode
  • Symptoms are not better accounted for by another disorder
  • Symptoms cause distress or impairment in the person's life

To unlock this lesson you must be a Member.
Create your account

Register to view this lesson

Are you a student or a teacher?

Unlock Your Education

See for yourself why 30 million people use

Become a member and start learning now.
Become a Member  Back
What teachers are saying about
Try it risk-free for 30 days

Earning College Credit

Did you know… We have over 200 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

To learn more, visit our Earning Credit Page

Transferring credit to the school of your choice

Not sure what college you want to attend yet? has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.

Create an account to start this course today
Try it risk-free for 30 days!
Create an account