The kidneys are behind the peritoneum, and pregnancy does not normally put much pressure on the kidneys, but an enlarged uterus tends to compress the ureters, which may lead to fluid retention or acute inflammation of the kidneys during pregnancy.
The kidneys are located in the posterior abdominal wall, on either side of the spine, behind the peritoneum. They are extraperitoneal organs, and generally do not put much pressure on the kidneys.
However, after pregnancy, with the increase of gestation, fetal development, the pressure of the enlarged uterus on the ureter, resulting in increased pressure in the ureter, coupled with the effect of progesterone, the smooth muscle tone of the urinary system is reduced. The ureter is thickened and peristalsis is weakened, the urine flow is slow, the renal pelvis and ureter are mildly dilated since the mid-pregnancy stage, and the right side of the ureter is often compressed by the right-turned pregnant uterus, which can lead to pyelonephritis.
Pregnant women are prone to acute pyelonephritis, with the right side being the most common. In early pregnancy, the bladder is compressed by the enlarged uterus, and frequent urination may occur, and the symptoms are relieved after the uterus grows out of the pelvis. In late pregnancy, after the fetal head enters the pelvis, the bladder is compressed and the pressure on the bladder and urethra increases, some pregnant women may experience frequent urination and urinary incontinence.
Pregnant women should pay more attention to rest, do not strain, eat more food containing vitamins and minerals, do not stay up late. When kidney discomfort occurs during pregnancy, it is recommended to seek timely medical attention, follow the doctor’s instructions for further examination, clarify the cause with the doctor’s help, and carry out targeted treatment or therapy.