While pyelonephritis does not usually have a significant impact on the fetus, persistent pyelonephritis can also lead to kidney failure. Long-term pyelonephritis can affect the health of the pregnant woman and may increase the rate of miscarriage or affect the health of the fetus. However, the time required for pyelonephritis to lead to adverse effects such as kidney failure is longer, usually 30 years. Therefore, pyelonephritis may have little effect on pregnancy, but pregnant women with pyelonephritis who have symptoms need to choose to apply antibiotics that do not affect the fetus. In addition, if the patient has more severe pyelonephritis and develops a fever or even needs to be hospitalized, this will also affect the patient’s own health, including the overall effect on the fetus. Therefore, patients with pyelonephritis can become pregnant, but the pregnancy may have an impact on the fetus and the mother. Therefore, pregnant women should drink plenty of water during pregnancy to avoid pyelonephritis. If pyelonephritis or urinary tract infection is present then both need to be treated aggressively.