After several weeks of feeling apathetic and dissatisfied with his life, Mark has suddenly become extremely cheerful and so talkative he can't be interrupted. He seems to need less sleep and becomes irritated when his friends tell him to slow down. Mark's behavior is indicative of

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Mark is displaying symptoms of bipolar disorder, specifically a manic episode. This includes symptoms such as increased talkativeness, decreased need for sleep, and irritability.

After Several Weeks of Feeling Apathetic and Dissatisfied with His