Chronic Kidney Disease Stages represent the gradual worsening of kidney function and are divided into five stages based on the glomerular filtration rate (GFR). Stage 1 indicates kidney damage with normal or near-normal function and few symptoms. Stage 2 shows a mild reduction in kidney performance. Stage 3, including stages 3A and 3B, involves a moderate decline with symptoms like fatigue and fluid retention. Stage 4 reflects severe kidney damage and requires careful medical management. Stage 5, known as end-stage kidney disease, requires dialysis or a kidney transplant to maintain life.