Moderate fluid retention in the kidneys due to stones is usually more serious.
When urine cannot be removed from the kidneys after a kidney stone blocks the ureter or pelvis, the urine will accumulate in the kidneys leading to hydronephrosis. In mild hydronephrosis, there is usually no harm to the kidneys, while moderate hydronephrosis may lead to an increase in intrarenal pressure, which can cause renal hypoplasia resulting in renal parenchymal damage.
Moderate hydronephrosis may show symptoms of upper urinary tract obstruction such as nausea and vomiting, renal colic, hematuria, etc. In serious cases, abdominal mass may appear; if the site of hydronephrosis is in the lower urinary tract, it will show difficulty in urination and urinary retention of bladder, and in serious cases, there will be different degrees of renal function damage.
Stone-induced moderate hydronephrosis should be treated in a timely manner under the guidance of a doctor to relieve the symptoms of renal compression and avoid aggravation of hydronephrosis.