Actaully, that is not 100% correct.

Rapid-cycling Bipolar can change moods during the day. Similar to Borderlines. Traditional Bipolar 1 moods occur over weeks to months. Bipolar 2 is usually daily or weekly.

The MAIN difference is that Borderlines have an intense fear of abandonment. Bipolars do not.

Additionally, Borderlines use a primitive defense mechanism called splitting ~ all good and all bad. Bipolars do not.

Otherwise many of the symptoms are similar.