Last month, Stacia was giddy, impulsive, and talkative; this month, she is sad, silent, and almost motionless. What is the most likely diagnosis in this case?

Question

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Stacia's symptoms suggest a significant shift in mood and behavior, which is characteristic of bipolar disorder. Bipolar disorder is a mood disorder that involves cycles of manic (giddy, impulsive, talkative) and depressive (sad, silent, motionless) episodes. This contrasts with severe depression (choice A), which typically involves prolonged periods of low mood and lack of energy, and anxiety disorder (choice B), which typically involves excessive worry and fear. Somatoform disorder (choice C) involves physical symptoms that cannot be fully explained by a medical condition, which is not the main concern in this case.

Last Month, Stacia Was Giddy, Impulsive, and Talkative; This Month