Swollen feet in bad kidneys may be caused by sodium retention and hypoproteinemia due to nephritis, nephrotic syndrome and other diseases, which can usually be treated by taking diuretics (e.g., furosemide), hormones (e.g., prednisone acetate), and immunosuppressant (e.g., cyclophosphamide, etc.) as prescribed by the doctor. In patients with nephritis, glomerular filtration is reduced and tubulo-glomerular feedback imbalance produces primary water and sodium retention, and water in the body is accumulated in the lower limbs due to gravity, which makes patients with bad kidney symptoms of swollen feet; in patients with nephrotic syndrome, due to the discharge of a large amount of proteinuria, combined with hypo-proteinemia, plasma colloid osmolality decreases, and water is seeping out of blood vessels to the extravascular, which can be clinically manifested as swelling of the feet. For edema, under the guidance of the physician to limit fluid intake, diuretics (such as furosemide, torasemide, etc.) treatment; at the same time, for the primary disease, feasible hormone (such as prednisone acetate), immunosuppressive drugs (such as cyclophosphamide, cyclosporine) treatment. Patients with bad kidneys and swollen feet should go to the regular hospital in time for relevant examinations to clarify the cause of the disease, and then under the guidance of the doctor for treatment.