Monteil has periods in which he is so depressed that he becomes suicidal. At other times, he is energetic and euphoric. He would probably receive the diagnosis of

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The alternating periods of depression and mania suggest bipolar disorder, which is characterized by episodes of both depression and manic or hypomanic episodes. Major depressive disorder would only involve depressive episodes without the presence of mania or hypomania. Seasonal mood disorder and dysthymia do not encompass the alternating symptoms of depression and mania.

Monteil Has Periods in Which He Is So Depressed That