Hydronephrosis is a problem that often occurs in pregnant women, due to the special period of pregnancy can not take drugs for therapeutic intervention, only through their own adjustment. Causes of hydronephrosis in pregnant women include fetal compression, urinary obstruction, ureteral compression, and pre-pregnancy gynecological surgeries, etc. For the causes of hydronephrosis on the left side of the kidney, treatment is as follows: 1) Pregnant women can use the right side of the bed to rest, avoiding the supine position, preventing compression to the left side, and alleviating the discomfort of hydronephrosis. 2) Reasonable control of the amount of water consumption based on the degree of hydronephrosis, ensuring a reasonable mix of nutrients during the process of controlling water consumption. 3) Appropriate strength and strength of the water during pregnancy. The first thing you need to do is to make sure that the nutrients are reasonably distributed during the process of controlling the amount of water you drink. 3, during pregnancy, you should carry out appropriate low intensity exercise to prevent the formation of hydronephrosis. 4, the left kidney hydronephrosis during pregnancy is not a disease, but an abnormality that occurs in the body during pregnancy, so long as you adjust the situation in time, you will be able to return to the normal state very soon, and the hydronephrosis symptom will be eliminated gradually after delivery.