Signs of aggression

Inability to experience pleasure

Lack of motivation

Low self-esteem

Psychomotor retardation

Serotonin

GABA

Dopamine

Epinephrine

Dysthymia

Major depressive disorder

Minor depressive disorder

Seasonal Affective Disorder

Bipolar disorder

Preoccupation with maintaining a rigid, productive schedule

Ahnedonia (an inability to experience any pleasure at all)

Lack of drive, initiative, and spontaneity

Pessimism due to feelings of hopelessness and helplessness

Disturbances in appetite and sleep

Major depressive disorder

Generalized anxiety disorder

Anorexia

Anemia

Excess levels of dopamine in the brain

Learned helplessness

The cognitive triad

Low levels of serotonin in the brain

Genetic predisposition

Depression, anxiety, and bipolar disorders

Schizophrenia, sociopathy, and obsessive compulsive disorder

Narcisssistic, histrionic, and dependent disorders

Depression, schizophrenia, and obsessive compulsive disorder

None of these

Major depressive episode

Major depressive disorder

Dysthymic disorder

Disruptive mood dysregulation disorder

Dysthymic disorder is a shorter form of major depressive disorder; it typically lasts less than one month

Dysthymic disorder is a longer version of major depressive disorder; it is diagnosed when a person has been experiencing depressive-like symptoms for more than two years

Dysthymic disorder is a less-disabling form of major depressive disorder

Dysthymic disorder is one of the possible patterns of unipolar depression

None of the other answers

Dsythymia is a pervasive "low level" depression that lasts numerous years, while major depressive disorder is a single episode of severe depression

Dsythymia is an anxiety disorder, while major depressive disorder is a mood disorder

Dsythymia includes bipolar symptoms, while major depressive disorder does not

Dsythymia occurs in children, while major depressive disorder occurs in teenagers and adults

Dsythymia includes hallucinations, while major depressive disorder does not