Polyps are diseases on the mucosal tissue, while the kidney is a parenchymal organ, and polyps in the parenchyma do not usually occur, but rather tumors growing in the parenchyma of the kidney can occur. Polypoid changes can occur in the mucosa of the renal pelvis. If polyp-like changes in the kidney occur, the possible effects on the human body are: 1. Symptoms of back pain occur. As the kidney polyps, the tumor increases in size, and the kidney is blocked from discharging urine. Some of the urine is stored within the kidney, forming hydronephrosis. The polyp may cause damage to the local mucosa during the growth of the polyp, which may result in a small amount of bleeding mixed with urine, and may appear as bright red or light red hematuria. 3, the damage to the renal parenchyma may occur when the polyp expands further, which may result in malignant changes and damage to the renal pelvis. This excludes bleeding and may be accompanied by damage to renal function or destruction of renal parenchyma, which leads to a decrease in filtration function, and patients show symptoms such as decreased urine volume and edema.