Which symptom is typically associated with Major Depressive Disorder?

The symptom that is typically associated with Major Depressive Disorder is the inability to experience pleasure or interest, also known as anhedonia. This core feature can significantly impact a person's daily functioning, as individuals may find that activities they once enjoyed no longer bring them joy or motivation. It often coexists with other symptoms of depression, such as feelings of hopelessness, fatigue, and changes in sleep or appetite.

In the context of Major Depressive Disorder, the presence of anhedonia is a critical factor that helps differentiate it from other mood-related conditions. It underscores how deeply depression can affect an individual's perception of life and their engagement with the world around them.

The other symptoms mentioned, such as increased energy, consistent feelings of happiness, and constant hyperactivity, are typically not associated with Major Depressive Disorder. Instead, these symptoms might be more characteristic of a manic or hypomanic episode, which is seen in conditions like Bipolar Disorder. Thus, the correct identification of anhedonia highlights a key symptom critical for understanding and diagnosing major depressive episodes.