labile affect
Pronunciation: LAY-bile
Rapid, dramatic shifts in emotional expression that are disproportionate to circumstances and difficult to control.
Full Definition
Labile affect refers to abnormal emotional responsiveness characterized by rapid, dramatic, and often unpredictable changes in emotional expression. Patients with labile affect may shift quickly from laughter to tears, anger to euphoria, or other emotional states without apparent external triggers or with responses that are grossly disproportionate to the situation. This symptom can occur in various psychiatric and neurological conditions, including mood disorders, personality disorders, traumatic brain injury, and certain neurodegenerative diseases. The emotional changes are typically brief, intense, and feel uncontrollable to the patient, significantly impacting social and occupational functioning.
Usage
Usage note: Distinguish from normal emotional variability and mood episodes.
In Context
- "The patient demonstrated labile affect during the interview, alternating between tearfulness and inappropriate laughter." — Mental status examination
- "Medication adjustment was considered to address the patient's labile affect following the stroke." — Treatment planning note