title: Bipolar disorder.
abstract: 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.
mesh_terms: D001714:Bipolar Disorder / Q000150:complications* / Q000175:diagnosis / Q000473:pathology* / Q000523:psychology*; D003866:Depressive Disorder / Q000175:diagnosis; D004509:Education, Nursing, Continuing; D006801:Humans; D006113:United Kingdom