IIRC it is considered axis one disorder.
Bipolar disorder
Bipolar disorder is generally caused by genetics.
The correct term is bipolar disorder. Some people call it a disease though.
a disorder
http://blogs.psychcentral.com/bipolar/2009/01/bipolar-disorder-qa-how-close-are-we-to-a-bipolar-cure/
Yes, stress makes Bipolar Disorder behavior worse. My daughter is Bipolar.
It's not known to be an effective treatment for bipolar disorder.
Bipolar Disorder, not otherwise specified. It means a form of Bipolar Disorder that doesn't really fit the other diagnostic categories.
They may be used in conjunction with mood stabilizing medication, which are used for bipolar disorder, but they are not used alone as a solution to bipolar disorder.
Manic depression, or manic depressive disorder is nowadays more commonly known as Bipolar disorder or Bipolar affective disorder. It can also be referred to as Hypomania due to public unawareness.
Bipolar disorder