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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.
In any case, until recently, the term, mood swings, did not refer to volatile moods. Apparently, however, without a discussion in the literature of this changed definition, mood swings have come to mean labile affect. Similarly, rapid cycling-defined in the DSM-IV as four or more switches in a year-not infrequently appears in clinical summaries when what is being described are labile moods.