Final answer:
Mood swings are a characteristic symptom of bipolar disorder.
Step-by-step explanation:
Mood swings are a characteristic symptom of bipolar disorder. Bipolar disorder is a mental health condition that causes extreme shifts in mood, energy, and activity levels. These mood swings can range from episodes of mania or hypomania, characterized by elevated mood and increased energy, to episodes of depression, characterized by low mood and decreased energy.
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