Acute bronchitis in pregnant women can affect the fetus if left untreated. Generally speaking, the presence of mild acute bronchitis in pregnant women does not have a great impact on the fetus, so there is no need to worry too much. If the symptoms of acute bronchitis in pregnant women are more serious, it may cause high fever, cough, phlegm, sore throat, runny nose, hoarse voice and other symptoms. If you do not receive timely treatment, it may cause further aggravation of the condition, chest tightness, shortness of breath, dyspnea, wheezing, and so on, and even develop into pneumonia, and then there will be insufficient blood supply and oxygen, for the fetus in the womb will also have an impact on the supply of oxygen, can cause intrauterine fetal hypoxia, fetal demise, and so on, a serious danger to the health of the mother and child. Pregnant women belong to a special group of people, when suffering from bronchitis, can not use drugs, need to go to the hospital, by professional doctors to diagnose and treat.