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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.
Affective lability : unstable, rapidly changing emotions. Quick changes of emotions or unstable mood is rather common for everyone. So this symptom can have very different forms and severity. Mild forms are not at all a sign of a major psychiatric disorders. But we refer to people with a quickly changing emotional response who have rapid and extreme mood changes within a very short period, and without appropriate external reasons.