Bipolar is a mood order and can shift for no apparent reason or a situation might happen to start it. Bipolar shifts lasts a couple weeks, borderline is more many mood changes in a day or 2 .... Fall and spring are tough times for me so it’s a definite chemical imbalance.

Borderline is more reactions to situations, like your suppost to meet your friend for lunch and they cancel last minute, of course it would be upsetting but if were to have an extreme rage-y reaction and it ruin your whole day it could be borderline.. people with borderline also have trouble with relationships of all types , there’s lots of push and pull. One min you push someone away usually in a Mean or cold way but then you feel abandoned and your wanting that person to come back, also manipulation to get people to do what you want.

Yes it quite common to have both