Mood disorder
Mood disorder, also known as mood affective disorders, is a group of conditions of mental disorder where a disturbance in the person's mood is the main underlying feature. The classification is in the "Diagnostic and Statistical Manual of Mental Disorders" (DSM) and International Classification of Diseases (ICD).

Mood disorders fall into the basic groups of elevated mood, such as mania or hypomania; depressed mood, of which the best-known and most researched is major depressive disorder (MDD) (alternatively known as clinical depression, unipolar depression, or major depression); and moods which cycle between mania and depression, known as bipolar disorder (BD) (formerly known as manic depression). There are several sub-types of depressive disorders or psychiatric syndromes featuring less severe symptoms such as dysthymic disorder (similar to but milder than MDD) and cyclothymic disorder (similar to but milder than BD). Mood disorders may also be substance induced or occur in response to a medical condition.

English psychiatrist Henry Maudsley proposed an overarching category of "affective disorder". The term was then replaced by "mood-disorder", as the latter term refers to the underlying or longitudinal emotional state, whereas the former refers to the external expression observed by others.
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mental disorder
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mood
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Diagnostic and Statistical Manual of Mental Disorders
MEDIA
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International Classification of Diseases
MEDIA
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mania
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hypomania
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major depressive disorder
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bipolar disorder
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dysthymic
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cyclothymic
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medical condition
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psychiatrist
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Henry Maudsley
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Mood disorder
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Mood disorder
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Mood disorder
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subclass of
subclass of
subclass of
symptoms and signs
symptoms and signs
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occupation