Kidney diseases, including chronic kidney disease, glomerulonephritis, and polycystic kidney disease, impair the organs’ capacity to filter metabolic waste, balance electrolytes, and regulate blood pressure. Because early renal damage often produces no symptoms, routine glomerular filtration rate testing and urinalysis remain critical for timely detection. Treatment protocols vary by stage, spanning blood pressure management, dietary sodium and protein modification, immunosuppressive agents, and, in end-stage cases, dialysis or transplantation. Coordinated nephrology care addressing comorbid diabetes and hypertension significantly slows progression toward renal failure. Consistent follow-up labs, hydration guidance, and avoidance of nephrotoxic drugs further protect residual kidney function and lower cardiovascular risk.