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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 Mood shifts suddenly in a way that cannot be understood in the context of the situation. During a friendly game of checkers, Dorothy, who has been laughing, suddenly knocks the board off the table in anger. She then begins to laugh and wants to continue the game. Elevated Mood is one of euphoria not necessarily related to the immediate situation.