What are the symptoms of pregnant women needing oxygen? Pregnant women need oxygen. It means that when some symptoms or abnormalities occur during pregnancy, oxygen is needed to help the body function normally. The following are several symptoms of pregnant women who need oxygen: 1. Shortness of breath Shortness of breath is a common symptom of pregnant women who need oxygen. As the fetus increases, the uterus compresses the diaphragm, causing the lung volume to decrease, affecting the pregnant woman\’s absorption of oxygen, resulting in oxygen