Bipolar disorder is a potentially lifelong and disabling condition that affects 1 per cent of the adult population and can vary in length and frequency.
Essential facts. Bipolar disorder is a potentially lifelong and disabling condition. Bipolar I, characterised by episodes of mania and depression, is estimated to affect 1 per cent of the adult population. Bipolar II, characterised by hypomania and depression, affects an estimated 0.4 per cent of adults. Episodes can vary in length and frequency.