What is depression?
How does depression differ from a sad day?
Depression is a mental health condition. Persistently low mood or a loss of pleasure and interest are central features. It differs from ordinary changes in mood. [1]
General information for adults. Not medical or psychotherapeutic advice; not a substitute for examination, diagnosis or treatment.
Sources & editorial status
- WHO: Depressive disorder (depression) ↗
International overview. Used for the distinction from mood changes and contributing factors.
Compiled from an existing article: 31 October 2026. Source comparison in the article: 29 October 2026. Prepared with AI assistance; independent medical review is pending. Editorial compilation; independent medical expert review has not taken place.
Editorial responsibility: Mario V.W.B.R. Obst. Known limitations and the use of each source are explained alongside the reference. A source-comparison date is not the publication date of the original source.