Bipolar disorder I is characterized by which pattern?

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Bipolar I is defined by the presence of manic episodes, with depressive episodes commonly occurring as well. The pattern described as intermittent mania and major depressive episodes reflects the alternation between high-energy, elevated mood during mania and periods of significant low mood during major depressive episodes. Mania features include reduced need for sleep, inflated self-esteem, rapid speech and thoughts, distractibility, and risky behaviors, while major depressive episodes involve persistent sadness or anhedonia, sleep and appetite changes, fatigue, feelings of guilt or worthlessness, and difficulty concentrating. This combination distinguishes bipolar I from persistent depressive disorder (no mania), from mania without depression (depression often accompanies bipolar illness), and from cyclothymia (mifts less severe, chronic mood fluctuations).