Which statement is true regarding the symptom patterns in bipolar I disorder?

In bipolar I disorder, it is established that individuals may experience not only manic episodes but also depressive episodes. This is a defining characteristic of the disorder, as bipolar I is marked by the occurrence of at least one manic episode, which may be preceded or followed by hypomanic or depressive episodes. The presence of depressive episodes is essential for a comprehensive understanding of the individual's mood fluctuations, as bipolar I disorder involves a cycle of mood states.

The absence of depressive episodes, solely having manic episodes, or the notion that high energy levels are constant do not accurately reflect the symptom patterns associated with bipolar I disorder. Depressive episodes can significantly impact the course of the disorder, leading to impairment in daily functioning and quality of life. Therefore, recognizing the potential for both manic and depressive episodes is crucial for diagnosis and understanding the overall impact of the disorder on individuals.