The feeling of swelling in the kidneys may be related to hydronephrosis or kidney stones and other reasons. 1. Hydrocele: In cases such as prostatic hyperplasia, kidney cancer, congenital developmental abnormality of the urinary tract, hydrocele may appear, causing swelling of the kidneys, at this time, there is a blockage of urine discharge, so that the renal pelvic pressure increases, tension increases, and the renal region is distended. 2. Kidney stones: kidney stone patients are mostly caused by lumbar pain, when the stone is small, the renal region can feel discomfort, the stone is large, can cause severe pain, renal region percussion pain, can be accompanied by hematuria or the appearance of stone discharge. Kidney fullness or other uncomfortable symptoms suggest timely to the hospital specialist consultation, improve the urological ultrasound or urine routine and other related examination, clear cause, cause and symptomatic treatment.