Bipolar disorder, formerly called manic depression, is a mental health condition that causes extreme mood swings that include emotional highs (mania or hypomania) and lows (depression).
When you become depressed, you may feel sad or hopeless and lose interest or pleasure in most activities. When your mood shifts to mania or hypomania (less extreme than mania), you may feel euphoric, full of energy or unusually irritable. These mood swings can affect sleep, energy, activity, judgment, behavior and the ability to think clearly.
Bipolar I disorder. You’ve had at least one manic episode that may be preceded or followed by hypomanic or major depressive episodes. In some cases, mania may trigger a break from reality (psychosis).
Bipolar II disorder. You’ve had at least one major depressive episode and at least one hypomanic episode, but you’ve never had a manic episode. Bipolar II disorder is not a milder form of bipolar I disorder, but a separate diagnosis. While the manic episodes of bipolar I disorder can be severe and dangerous, individuals with bipolar II disorder can be depressed for longer periods, which can cause significant impairment.
Cyclothymic disorder. You’ve had at least two years — or one year in children and teenagers — of many periods of hypomania symptoms and periods of depressive symptoms (though less severe than major depression).
Mania and hypomania
Mania and hypomania are two distinct types of episodes, but they have the same symptoms. Mania is more severe than hypomania and causes more noticeable problems at work, school and social activities, as well as relationship difficulties. Mania may also trigger a break from reality (psychosis) and require hospitalization.
Both a manic and a hypomanic episode include three or more of these symptoms:
• Abnormally upbeat, jumpy or wired
• Increased activity, energy or agitation
• Exaggerated sense of well-being and self-confidence (euphoria)
• Decreased need for sleep
• Unusual talkativeness
• Racing thoughts
• Poor decision-making — for example, going on buying sprees, taking sexual risks or making foolish investments
Major depressive episode
A major depressive episode includes symptoms that are severe enough to cause noticeable difficulty in day-to-day activities, such as work, school, social activities or relationships. An episode includes five or more of these symptoms:
• Depressed mood, such as feeling sad, empty, hopeless or tearful (in children and teens, depressed mood can appear as irritability)
• Marked loss of interest or feeling no pleasure in all — or almost all — activities
• Significant weight loss when not dieting, weight gain, or decrease or increase in appetite (in children, failure to gain weight as expected can be a sign of depression)
• Either insomnia or sleeping too much
• Either restlessness or slowed behavior
• Fatigue or loss of energy
• Feelings of worthlessness or excessive or inappropriate guilt
• Decreased ability to think or concentrate, or indecisiveness
• Thinking about, planning or attempting suicide
Other features of bipolar disorder
Signs and symptoms of bipolar I and bipolar II disorders may include other features, such as anxious distress, melancholy, psychosis or others. The timing of symptoms may include diagnostic labels such as mixed or rapid cycling. In addition, bipolar symptoms may occur during pregnancy or change with the seasons.
Sources: Mayo Clinic