Which is the most common type of depressive disorder characterized by periods of downcast mood and feelings of worthlessness?

Major Depression is characterized by recurrent periods of a persistently downcast mood, accompanied by a significant loss of interest or pleasure in most activities. Individuals with this disorder often report feelings of worthlessness, excessive guilt, fatigue, and difficulty concentrating, which can severely impact their daily functioning and quality of life. These depressive episodes can last for weeks or longer and may vary in frequency and intensity.

In contrast, Bipolar Disorder involves cycles of mood changes that include both depressive and manic episodes, making it distinct in nature from Major Depression, which is solely focused on depressive symptoms. Somatic Symptom Disorder revolves around physical symptoms that cause significant distress or impairment, rather than emotional states or mood disorders. Lastly, Dissociative Amnesia pertains to memory loss related to specific events or personal information and does not encapsulate the emotional characteristics associated with Major Depression. Thus, Major Depression stands out as the disorder best embodying the defined characteristics of downcast mood and feelings of worthlessness.