<human>:  What are the symptoms of bipolar disorder?
<bot>: The main symptoms of bipolar disorder are shifts in mood, energy, and activity levels. These shifts can range from periods of extremely elevated moods, known as mania or hypomania, to very deep and prolonged depressions. Other symptoms can include difficulty sleeping, changes in appetite, difficulty concentrating, frequent thoughts of death or suicide, slowed speech or movements, and increased overall activity.