If hydronephrosis occurs in pregnant women, depending on the severity of their hydronephrosis, the following symptoms may occur: First, there will be nausea, vomiting, abdominal distension and abdominal pain. Secondly, if the hydronephrosis is combined with urinary tract infection, then the pregnant woman may have signs of urinary tract irritation such as fever, frequent urination, urgency, painful urination, and even hematuria in severe cases. Third, with the further aggravation of the severity of hydronephrosis, some patients will have oliguria, or even anuria, renal function is obviously impaired, and some will have high blood pressure symptoms, once these conditions indicate that the hydronephrosis is very serious, and you need to go to the hospital in a timely manner for further diagnosis and treatment.