Mood instability, defined as frequent, sudden, and unpredictable alterations in irritability, elation/activation, and anxiety/depression, is associated with psychopathology in youth and adults. While transdiagnostic, mood instability has unique associations with bipolar disorder (BD) and can occur inter-episodically.1 Mood instability is a risk for BD type 1 or type 2 in high-risk individuals.
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