The normal range of expressed affect varies considerably between different cultures and even within the same culture.
Types of affect include:
Euthymic mood would be considered as the "normal" stable mood without complaints.
Affective Disorders are mental health disorders with observable alteration of affect (mood). This would include Major Depression, Dysthymia / Cyclothymia, Bipolar disorder and Adjustment disorders and a broader category of depressive symptoms, which do not fit in the classical categories of mood disorders (Depressive disorders not otherwise specified).