Depression may refer to:

Mental health

Depression (mood) Depression is a mental state of low mood and aversion to activity, which affects more than 280 million people of all ages (about 3.5% of the global population). Classified medically as a mental and behavioral disorder, the experience of ...

, a state of low mood and aversion to activity *

Mood disorder A mood disorder, also known as an affective disorder, is any of a group of conditions of mental and behavioral disorder where a disturbance in the person's mood is the main underlying feature. The classification is in the ''Diagnostic and Stat ...

s characterized by depression are commonly referred to as simply ''depression'', including: **

Dysthymia Dysthymia ( ), also known as persistent depressive disorder (PDD), is a mental and behavioral disorder, specifically a disorder primarily of mood, consisting of similar cognitive and physical problems as major depressive disorder, but with lon ...

, also known as persistent depressive disorder **

Major depressive disorder Major depressive disorder (MDD), also known as clinical depression, is a mental disorder characterized by at least two weeks of pervasive low mood, low self-esteem, and loss of interest or pleasure in normally enjoyable activities. Introdu ...

, also known as clinical depression

Economics

Economic depression An economic depression is a period of carried long-term economical downturn that is result of lowered economic activity in one major or more national economies. Economic depression maybe related to one specific country were there is some economic ...

, a sustained, long-term downturn in economic activity in one or more economies **

Great Depression The Great Depression (19291939) was an economic shock that impacted most countries across the world. It was a period of economic depression that became evident after a major fall in stock prices in the United States. The economic contagio ...

, a severe economic depression during the 1930s, commonly referred to as simply ''the Depression'' ** Long Depression, an economic depression during 1873–96, known at the time as the ''Great Depression''

Biology

* Depression (kinesiology), an anatomical term of motion, refers to downward movement, the opposite of elevation * Depression (physiology), a reduction in a biological variable or the function of an organ * Central nervous system depression, physiological depression of the central nervous system that can result in loss of consciousness

Earth science

Depression (geology) In geology, a depression is a landform sunken or depressed below the surrounding area. Depressions form by various mechanisms. Types Erosion-related: * Blowout: a depression created by wind erosion typically in either a partially vegetated ...

, a landform sunken or depressed below the surrounding area *

Depression (weather) In meteorology, a low-pressure area, low area or low is a region where the atmospheric pressure is lower than that of surrounding locations. Low-pressure areas are commonly associated with inclement weather (such as cloudy, windy, with possible ...

, an area of low atmospheric pressure characterized by rain and unstable weather {{Disambiguation