Aortic dissection is a relatively rare but serious disease. Herein, we report a case of type A aortic dissection in a 41-year-old female patient at 34 weeks of gestation. The woman visited our emergency department due to severe, sudden-onset and persistent chest pain radiating to her back. The physical examination was normal except for hypertension and absence of left-side dorsalis pedis artery pulse. Electrocardiography and cardiac enzyme levels were both normal. Computed tomography revealed aortic dissection from the ascending aorta to the low abdominal aorta. An emergency caesarean section was arranged, followed by ascending aortic reconstruction and aortic valve resuspension. Unfortunately, the patient expired 10 days after surgery due to bowel ischemia. If a pregnant woman arrives at an emergency department with high blood pressure, preeclampsia is usually the first concern. However, if she also complains of chest pain radiating to her back, the possibility of aortic dissection should also be considered, and emergency surgery should not be delayed if the diagnosis is established.