A woman’s 37th week of pregnancy belongs to the late stage of pregnancy, when the fetus needs more nutrition and the burden on the pregnant woman’s body will gradually increase. It will mainly increase the burden on the heart and lungs, and the gradually enlarged abdomen will also compress the lungs and heart, affecting the function of the heart and lungs, which will easily cause chest tightness and breathlessness. At this time, you need to pay attention to rest and avoid overexertion. If the symptoms are more serious, you need to go to the hospital for examination first. Oxygen deficiency can affect the health of the pregnant woman and the normal growth and development of the fetus. It is necessary to inhale oxygen in time and also to check whether there are heart diseases and respiratory diseases, and to treat them actively according to the examination results. From the beginning of pregnancy, it is necessary to pay attention to the diet and to strengthen the heart and lung function with appropriate activities. If you are not active regularly, it is easy to cause this symptom in late pregnancy. If it is not relieved by self-treatment, hospital consultation is recommended to exclude cardiopulmonary diseases.