What are the differences between bipolar disorder and borderline personality disorder?

Differences: Bipolar disorder is not a personality disorder. It is a mental illness characterized by cycles of mania and depression and is treated with medication. Borderline pd tend to have extreme reactions to things, fear of abandonment, distorted self-image, frequent suicidal thoughts or threats, they may cut on themself to relieve emotional pain. Dialectical behavioral therapy can be helpful.

Borderline: Intense fear of abandonment, being manipulative, impulsivity, a tendency to think of people and things in all good or all bad terms, self mutilating behaviors, drug and alcohol abuse, sexual impulsivity, a profoundly disturb sense of self, and extreme emotional volatility. Bipolar disorder is characterized by extreme mood swings from deep depression to the stratosphere of mania.

Mood vs relationship: Bipolar disorder is a mood disorder, characterized by the patient vacillating between mania and depression. Borderline personality disorder is, as implied a personality disorder and NOT a mood disorder. Borderline PD is characterized by profound fear of abandonment, disturbed sense of self, impulsivity, extreme emotional reactivity, self mutilating behaviors, and idealization/devaluation.