Final answer:
The term "Double Depression" refers to Persistent Depressive Disorder (PDD) when accompanied by episodes of Major Depressive Disorder. PDD is a chronic form of depression with long-lasting symptoms, differentiated from other mood disorders such as Major Depressive Disorder and Bipolar Disorder.
Step-by-step explanation:
The medical condition sometimes referred to as "Double Depression" is C) Persistent Depressive Disorder (PDD). PDD, also known as dysthymia, is characterized by a chronic depressive mood that lasts for at least two years in adults. When an individual with Persistent Depressive Disorder also experiences episodes of Major Depressive Disorder, it is referred to as "Double Depression." This condition involves the combination of both long-term, low-level depression along with periods of more severe depression.
It's important to differentiate PDD from other mood disorders, such as Major Depressive Disorder (MDD) and Bipolar Disorder. MDD is characterized by severe depressive episodes that last more than two weeks, while Bipolar Disorder is notable for its cycling between high-energy (manic) and low-energy (depressive) states. Seasonal Affective Disorder (SAD) is another type of depression that is related to changes in the seasons, particularly occurring during the winter months when there is less natural sunlight.
Mood disorders are among the most common mental disorders in the United States and can significantly impact the daily lives of those affected. Treatments for these conditions vary and may include psychotherapy, medications, or other interventions such as light therapy for SAD.