Bad kidney can lead to swollen feet, the following specific analysis: bad kidney refers to patients suffering from glomerulonephritis, renal failure and other diseases. The above diseases can lead to lower limb edema, the following separate elaboration: 1, glomerulonephritis, glomerulonephritis patients will appear positive urine protein, loss of albumin in the body, so there is hypoproteinemia, when the plasma osmolality decreases, the appearance of double lower limb edema. The treatment at this time should be to reduce urine protein and replenish protein in the body to improve edema. 2. renal failure, if the patient has renal failure, the kidneys can not produce and discharge urine, so the patient will have little or no urine, the excess water in the body can not be discharged and lead to double lower extremity edema. The treatment at this time is to give diuretics to increase urine discharge, and if necessary, to perform dialysis treatment.