Elaine feels that her life is empty. she has lost interest in career and hobbies, and she wonders if she would be better off dead. she is most likely suffering from a(n):

A mood disorder

Mood disorders are illness in which an individual experiences serious change in mood or emotions. An individual with this disorder may feel sad or empty. Depression is the common feature of mood disorder. Major depressive disorder, bipolar disorder, persistent depressive disorder and seasonal affective disorder are all illnesses under mood disorders. For the question given above, Elaine is most likely suffering from a mood disorder.

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