Studies have reported a prevalence for HA in communities between 0,2-4,5% [2,28] and in primary care between 0,8-7.0% [3-7], and using the new and more valid criteria on 9,5% (12.1% incl. mild degree) [1] and in secondary care on 10-20% [8-9]. Severe HA has an early onset with mean age of onset = 25 years [1], an equal sex distribution, it is fluctuating but persistent with a median duration before treatment on 2- 20 years [10,11,31,45], and it is distressing and disabling and therefore also costly for our health and social care system [12,13].