Does pregnancy cause hydronephrosis?

Hydronephrosis is a condition of kidney

failure

caused by obstruction of urine excretion. In early pregnancy, the uterus is small and does not cause significant compression on the urinary tract, so it does not affect the normal transport of urine. In late pregnancy, the uterus is large and may compress the fallopian tubes and renal pelvis, causing urine retention in the kidneys, but the probability of this is low

.