No, multiple personality disorder, now known as dissociative identity disorder (DID), is not the same as bipolar disorder. DID is characterised by two or more distinct personality states or identities within a single individual and an inability to recall personal information beyond what is typical for forgetfulness. In contrast, bipolar disorder is a mood disorder marked by extreme mood swings, including manic highs and depressive lows. While both are complex mental health conditions, they have distinct symptoms, causes and treatment approaches.