The fetal heart rate can reflect the state of the fetus in the uterine cavity and can change as the internal environment of the uterus continues to change. The normal fetal heart rate is 110-160 beats per minute, and more than 160 may indicate abnormality. However, due to the different information about the fetal constitution and the scenario in which the fetus is placed, whether the fetal heart rate of 160 to 170 is normal or not needs to be analyzed on a case-by-case basis. If the duration is short, it may be a normal physiological change and is usually considered normal, but if the symptoms persist, consider that the fetus may be at risk of asphyxia. The normal range of fetal heart rate is the heart rate measured when the fetus is in a calm state. When in fetal movement, the fetal heart rate may have a higher increase, at 160-170 beats/min or even higher, and then the fetal heart rate will gradually return to normal after the fetus is quiet. In addition, if the pregnant woman has emotional stress, anemia or hyperthyroidism, the fetal heart rate may also increase, after the emotional relief and treatment of the disease, the normal value of fetal heart can be restored. If the fetal heart rate is always 160-170 beats per minute, you need to go to the hospital to investigate the cause of the increased fetal heart rate, and then take targeted measures to treat it. There are many common factors that can cause the fetal heart rate to increase, such as intrauterine infection, umbilical cord wrapping around the neck or the pregnant woman has taken certain drugs, which cause the fetus to become hypoxic in the uterus and the fetal heart rate to increase. If the fetal movement decreases and the fetal heart rate is too fast or too slow, you should immediately go to the hospital to investigate the possible factors and take active measures to deal with them.