Chronic Kidney Disease

Most kidney problems, however, happen slowly. You may have "silent" kidney disease for years. Gradual loss of kidney function is called chronic kidney disease (CKD) or chronic renal insufficiency. People with CKD may go on to permanent kidney failure. They also have a high risk of dying from a stroke or heart attack.

source: http://kidney.niddk.nih.gov/kudiseases/pubs/yourkidneys/index.htm