Hi just looking for some feedback. My 34 yr old sister has been diagnosed bipolar but some drs have suggested she might be borderline personality instead because she gets angry when in certain moods and has a history of abuse. Se has had chronic depression for maybe 15 yrs with mixed states and hypomania but mainly depression. No treatment has ever worked until she was put on lithium 3 months ago. All her symptoms have totally disappeared. She's not depressed at all and her mood is stable. We were told this can change later on but is this response possible in borderline people or more likely bipolar? I'm bipolar myself and on lamictal and I think she's bipolar and the anger is just part of it. But I'm open to hearing otherwise. I just assumed if she was borderline it wouldn't be as simple as taking lithium? How do non bipolars generally respond to lithium on its own? Her blood level is 0.9 last time I heard.