Sudden chest tightness, shortness of breath, dyspnea and panic in pregnant women can be caused by normal physiological phenomena, emotional stimulation, congenital heart disease, nutritional deficiencies and cardiovascular diseases. 1. Normal physiological phenomenon: with the depth of pregnancy, the growing uterus will lead to diaphragm compression, which in turn causes breathing difficulties and chest tightness, panic and shortness of breath and other symptoms, but these are normal physiological phenomena, generally does not affect health, with the end of pregnancy can be restored to normal. 2. Emotional stimulation: During pregnancy, if a woman is subjected to severe emotional stimulation, such as great sadness or shock, etc., it may induce chest tightness, shortness of breath, dyspnea and panic and other symptoms. 3. Congenital heart disease: If a woman suffers from congenital heart disease and is affected by pregnancy factors, it will also lead to an increase in the burden on the pregnant woman’s heart, which in turn will cause symptoms such as chest tightness, shortness of breath, dyspnea and panic. 4. Malnutrition: If a pregnant woman suffers from malnutrition or iron deficiency anemia during pregnancy, it may also cause symptoms such as chest tightness, shortness of breath, dyspnea and panic. 5. Cardiovascular diseases: including coronary heart disease and atherosclerosis, may also cause chest tightness, shortness of breath, dyspnea and panic. Therefore, if the pregnant woman suddenly appeared chest tightness, shortness of breath, dyspnea, panic and other symptoms need to consult a doctor in a timely manner, in order to clarify the specific causes of the disease, and give targeted treatment.