BPD and Bipolar Disorder
The exact cause of bipolar disorder is not known, much like other mental disorders. People with bipolar disorder have extreme mood swings which range from mania to depression that may last for weeks and even up to months. Unlike those who have bipolar disorder, the mania and the depression or the mood swings of patients with borderline personality disorder would only last for a couple of hours to almost a day.
Bipolar patients, like those afflicted with borderline personality disorder, also have suicidal tendencies due to feelings of worthlessness and loneliness. But another difference between bipolar disorder and borderline personality disorder is that bipolar individuals do not always commit self-mutilation. Self-mutilation and substance abuse are the fastest relief patients with borderline personality disorder use.