People with bdp have more fluctuations to their mood everyday. Bi polar is usually feeling like you're at the top of the world one day and at the bottom the next day. Thats how my phycyatrist explained it to me. She said bi polar people dont have as many fluctuations in their mood.

It is definitely a possibility it is hard to diagnose since they are so similar so you have to fall into the specifics of both categories so it takes alot of self awareness and discussion with your psych to figure it out but I do know that you can have both since I am professionally diagnosed with both bpd and Bipolar.

Ive talked to a psychologist about this and here are the main differences: - bipolar mood swings will last a long time. They can go weeks to months to years, while borderline is more of a day to day thing. With borderline, you may feel on top of the world while you wake up, then go to bed later feeling lower than the mariana trench - borderlines mood swings are usually caused or influenced by social events, like other peoples reactions etc. Bipolar mood swings are not, they happen almost randomly and wont be changed easily.

Its also possible to be in the rare 20% like me who have both