The majority of cystic fibrosis patients have chronic or intermittent pains. These pains have important consequences on the quality of life. Currently, the treatment is essentially pharmacological (essentially paracetamol) but it is not enough in presence of of visual analogue scale (VAS) >4. In the study, the patients will receive in addition to an usual pharmacological and psychological management, sophrology sessions at home. The sophrology is a dynamic method of physical and psychical relaxation. This aims are to decrease the pain, to decrease the anxiety and to improve the everyday life. This study will provide a new global strategy of the management of the patients' pain.