The kidneys are the main organ that produces and discharges urine. Without the kidneys, urine cannot be discharged and the body retains water and sodium, so the patient will have swelling of both lower limbs or even swelling of the whole body. 3, the kidney is also an endocrine organ, if there is no kidney, patients will appear anemia and other symptoms, because the kidney secretes erythropoietin, and without the kidney patients will lack erythropoietin, then there will be anemia and other symptoms.