Kidney stones may cause edema, but edema is caused by the occurrence of kidney failure. If the kidney stone is not combined with hydronephrosis and abnormal kidney function, it will not cause edema. Edema may be caused by other diseases, which need to be clarified by tests related to other organs. If the kidney stone blocks the outlet of renal pelvis and ureter, the urine produced by the kidney can not be eliminated from the body in time, and hydrocele will be formed when it accumulates within the kidney. In the long run, it will lead to the decline of kidney function, then the metabolism of water by the kidney decreases, and the water will be stored in the body, resulting in edema of the limbs or face, accompanied by a decrease in the amount of urine. Renal function test can find serum urea nitrogen, creatinine level is increased, suggesting that renal insufficiency has occurred. If the kidney stone does not cause urinary tract obstruction, does not cause hydronephrosis and renal function damage, at this time the edema has nothing to do with kidney stones, need to go to the hospital for examination to further determine.