The symptoms of dyspnea when pregnant women are more than 8 months pregnant is a relatively common clinical manifestation in late pregnancy, the causes of this symptom mainly include: 1. It is due to the rise of the bottom of the uterus in late pregnancy to compress the heart, so that the normal blood uptake function of the heart is affected, thus causing the symptoms of dyspnea. 2. The anatomical position will change to a certain extent, which will further aggravate the symptoms of dyspnea. 3. With the increase in the number of weeks of pregnancy, the circulating blood volume in the pregnant woman’s body will further increase, and the burden on the heart will increase accordingly, which will aggravate the symptoms. 4. The occurrence of more serious iron deficiency anemia in late pregnancy is also the main reason for causing and aggravating the symptoms of dyspnea in late pregnancy. 5. If there are Complications in pregnancy, such as hypertension in pregnancy, combined pulmonary hypertension in pregnancy, etc. If you have difficulty in breathing in late pregnancy, you should go to the hospital in time.