Cramps are a frequent and severe complication in CKD patients. Their characteristics : triggering factors, associated factors, are not well known. There is no recognized effective treatment. Using a questionnaire, the investigators wish to determine prevalence, severity and associated factors of cramps in our CKD patients. Better knowledge about cramps in CKD patients will allow to better support, and give a practical tool for treatment evaluation.

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.

Inclusion Criteria:

• Voluntary patients with CKD III to V (GFR<60ml/mn/1,72M2), including dialysed patients (hemodialysis or peritoneal dialysis).
• Non opposed to participate to the research.

Exclusion Criteria:

• Transplanted patient with functional graft.

Every patient with Chronic Kidney Disease (non dialysis and dialysis patients)