When you are seven months pregnant, you feel difficulty in breathing. This should be due to the enlargement of the fetus and the enlargement of the uterus that presses on the organs above the diaphragm and presses on the heart, resulting in a decrease in the amount of blood circulation to the heart, which can lead to a condition of ischemia and hypoxia of the heart muscle and cause difficulty in breathing. There is also a condition of pulmonary atelectasis caused by compression of the lungs, which affects the respiratory function of the lungs and leads to dyspnea. In this case, you should pay attention to bed rest and not to overexert yourself. If you overexert yourself, it will aggravate the state of myocardial ischemia and hypoxia, which will cause the symptoms of dyspnea to worsen. During this period, an electrocardiogram should also be done to rule out organic pathology. If the heart has organic pathology will lead to dyspnea, panic, tachycardia symptoms, when there is dyspnea, the best way to improve the symptoms is to take oxygen.