Difficulty in breathing for pregnant women may be a normal phenomenon caused by the growth of pregnancy, or it may be caused by diseases such as asthma, high blood pressure during pregnancy, and other diseases such as coronary heart disease. 1. pregnancy growth: pregnant women during pregnancy, with the growth of pregnancy, the stomach will become larger, will press the heart and lungs, resulting in the growth of the heart load, thus the phenomenon of difficult to breathe, is a normal physiological manifestation. 2. Asthma: asthma is mainly caused by genetic and environmental factors, the patient’s main symptoms are wheezing, shortness of breath, chest tightness, dyspnea, etc., but also weakness, sore throat, bruises and other symptoms. 3. Hypertension in pregnancy: The cause of hypertension in pregnancy is not clear, and it is considered to be caused by many factors such as the pregnant woman, the placenta and the fetus. Patients will have symptoms such as elevated blood pressure, proteinuria, edema, heart failure, etc. They will also have symptoms such as blurred vision, headache, etc., which will lead to the phenomenon of difficult breathing in pregnant women. 4. Other: Coronary heart disease, pneumonia and other diseases can also cause pregnant women to have difficulty breathing. Pregnant women who have difficulty breathing should consult a doctor in time and follow the doctor’s instructions for treatment.