The investigator have elaborated a specific questionnaire for our CKD patient about cramps. This questionnaire concerns only cramps, regardless of the origin. The first question of the questionnaire will allow to evaluate the prevalence of cramps in our population of CKD patients. Every patient will indicate his medical treatment and biological datas. Only patients who will answer " Yes " to the first question will complete the cramp score of gravity questionnaire. This score is composed of 4 items : frequency of crisis, there impact on sleep, there duration and there intesity Patients will also indicate for how long time there have experimented cramps, the muscular zones involved, associated symptoms, triggering factors, and does something can help them for cramps (medicinal or non medicinal).
The third part concerns there treatment and biological datas. Finally there will complete the QOL-SF12 questionnaire.
