Breathlessness in the seventh month of pregnancy may be due to uterine compression, overloading of the heart, hypoglycemia and other reasons. 1. Uterine compression: as the pregnant woman’s pregnancy weeks increase, the uterus will also increase in size, the diaphragm uplift may squeeze the lungs, resulting in a smaller lung capacity, so that the lungs are pressurized, resulting in tightness in the chest and breathlessness. 2. Overloaded heart: Pregnant women in their seventh month of pregnancy will have an overloaded heart due to the increase in blood volume, resulting in symptoms such as rapid heartbeat, difficulty in breathing and breathlessness. 3. Hypoglycemia: If you suffer from hypoglycemia during pregnancy, it may also cause symptoms such as dyspnea, breathlessness, and dizziness at the same time. If the pregnant woman appears seven months pregnant dyspnea, breathlessness, it is recommended to seek medical attention in a timely manner, under the guidance of the doctor, improve the relevant examination, to clarify the cause of the disease, the cause of the treatment.