A pervasive and sustained emotion that colors the perception of the world. Common examples of mood include depression, elation, anger, and anxiety.
In contrast to affect, which refers to more fluctuating changes in emotional "weather," mood refers to a pervasive and sustained emotional "climate."

Types of mood include
- Dysphoric: an unpleasant mood, such as sadness, anxiety, or irritability.
- Elevated: an exaggerated feeling of well-being, or euphoria or elation. A person with elevated mood may describe feeling "high," "ecstatic," "on top of the world,"or "up in the clouds."
- Euthymic: mood in the "normal" range, which implies the absence of depressed or elevated mood.
- Expansive: lack of restraint in expressing one's feelings, frequently with an overvaluation of one's significance or importance.
- Irritable: easily annoyed and provoked to anger.

American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders. 5th ed. Washington, DC. American Psychiatric Association. 2013. p. 824.