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Quick Answer. In a psychological context, labile mood refers to a mood state in which a person experiences wild, uncontrolled mood swings. Labile mood is also known as labile affect, emotional dysregulation and pseudobulbar affect.
Labile affect is also known as pseudobulbar affect, emotional incontinence, or involuntary emotional expression disorder (IEED). Example: In describing her marriage, a woman is sobbing bitterly one moment, then laughing wildly the next.