What are the leading global causes of chronic kidney disease?

• A. Polycystic kidney disease and nephrolithiasis
• B. Autoimmune glomerulonephritis and dehydration
• C. Hyperkalemia and acidosis
• D. Diabetes and hypertension

Answer: (D)

The main concept here is that chronic kidney disease most often stems from long-standing metabolic and vascular diseases, specifically diabetes and hypertension, which together cause the majority of CKD cases worldwide.

Diabetes damages the kidneys through chronic high blood glucose. This leads to changes in the tiny filtering units of the kidney: thickened filtering membranes, expanded mesangial tissue, and later scarring (glomerulosclerosis). Over time, these changes reduce filtration capacity and progress to chronic kidney disease. Hypertension injures the kidneys by pushing high pressure into renal vessels, promoting arteriolosclerosis and nephrosclerosis. The resulting reduced blood flow and scarring gradually impair kidney function, accelerating CKD progression.

These two conditions are so impactful because they’re highly prevalent globally and often coexist with aging, obesity, and sedentary lifestyles. That combination makes diabetic nephropathy and hypertensive nephrosclerosis the leading global drivers of CKD, more so than genetic disorders or obstructive issues.

Other options can contribute to kidney problems but don’t account for CKD as a whole. Genetic diseases like polycystic kidney disease cause CKD in some individuals, stones or obstruction from nephrolithiasis can cause kidney damage, autoimmune glomerulonephritis can injure renal tissue, and dehydration can precipitate acute spikes in kidney stress—but they do not explain the large, worldwide burden of CKD the way diabetes and hypertension do.