Unipolar or Bipolar Disorder – What’s all the Fuss About?
One of the most common questions in clinical practice posed by colleagues and patients alike is – “Is this Bipolar (Bipolar Disorder) Or Unipolar Disorder (Depression)?”
Differentiating the two poses a clinical challenge. Evidence suggests that misdiagnosis in bipolar disorder is a frequent occurrence.
The absence of biologically-relevant diagnostic markers of BD results in misdiagnosis of the illness as major depressive disorder, or recurrent unipolar disorder (UD) depression, in 60% of bipolar individuals seeking treatment for depression. 
In the ANZJP article, the authors Malhi and Porter start the article with the following quote
To the befuddlement of physicists, the universe is expanding; in fact it is accelerating apart at an unbelievable rate ………….While the implications of this are profound, the time frame involved means there is little chance of any direct impact on human kind as we know it. In contrast, another kind of expansion is affecting our lives here and now and also seems to have no end in sight; the diagnostic expansion of bipolarity.”