Which medical condition is characterized by persistent sadness, loss of interest, and related physical symptoms?

• A. Depression
• B. Anxiety Disorder
• C. Bipolar Disorder
• D. Schizophrenia

Answer: (A)

Recognizing this pattern hinges on identifying a mood disorder characterized by a persistent sad mood with diminished interest in activities and accompanying physical changes. When someone feels sad most days, loses interest in things they once enjoyed (anhedonia), and experiences sleep or appetite changes, fatigue, or slowed thinking for a sustained period—typically at least two weeks—that constellation points to depression. The emphasis is on both the enduring low mood and the loss of interest, plus the physical symptoms that commonly accompany it, rather than just temporary sadness.

Other conditions would present differently. Anxiety disorders center on excessive worry and physical arousal rather than a sustained low mood with anhedonia. Bipolar disorder includes depressive episodes but also distinct periods of elevated mood (manic or hypomanic episodes), which aren’t described here. Schizophrenia involves psychotic symptoms such as delusions or hallucinations and disorganized thinking, not simply sadness and loss of interest.

So, the combination of persistent sadness, loss of interest, and related physical symptoms best fits major depressive disorder.