The aim of the study is to investigate the effect of pregabalin in pain resulting from chronic pancreatitis. The effect will be investigated by means of questionnaires concerning the daily experience of pain and the general quality of life. Furthermore the patients will be invited to participate in experimental testing with a multimodal pain model. The experimental testing will include stimulation of the skin, muscle and visceral tissue. The results from the experimental part of the study may help us to understand the mechanisms of action of pregabalin in this patient population.