Chronic renal failure involves the irreversible destruction of nephrons in both kidneys, leading to various stages characterized by different symptoms and diagnostic evaluations. Key causes include glomerular dysfunction, systemic diseases, and urinary tract obstruction, while manifestations can be neurological, integumentary, cardiovascular, pulmonary, gastrointestinal, hematologic, reproductive, and musculoskeletal. Management includes pharmacological therapy, nutritional support, and dialysis to replace lost kidney functions.