躁鬱症
Bipolar disorder is usually expressed through varying mood swings, between high and low. Elevated moods, or mania, are characterized by joy, energy, or irritability. Depressed moods are characterized by pessimism, crying, or lack of confidence. The underlying cause of Bipolar Disorder is not fully understood, but it is believed that abnormalities in the prefrontal cortex may contribute to the lack of emotional control and regulation.