Chest pain during pregnancy is defined as chest pain that occurs during pregnancy. Most of the chest pains that occur during pregnancy have anterior cardiac pain or angina pectoris as the clinical manifestation. It is caused by gestational myocardial infarction. Myocardial infarction of pregnancy is a rare complication of pregnancy. It is rarely reported in China. This type of myocardial infarction is different from other types of myocardial infarction because it not only endangers the life of the pregnant woman, but also poses a threat to the fetus. How to check for chest pain in pregnancy? 1. Elevated serum cardiac enzymology. Significantly increased CK, CK-MB, glutamate transaminase, lactate dehydrogenase and other abnormal changes can be seen, mainly increased activity of CK isoenzyme (CK-MB). 2. Increased blood sedimentation. 3.Patients may have increased concentration of blood lipids and blood glucose. 4. Straightening of the left heart margin, elevated heart position and obvious vascular shadow on chest X-ray. 5.Electrocardiogram electrical axis left deviation, non-specific ST and T wave changes, may have the typical pattern of myocardial infarction or show a series of electrocardiogram evolution of acute myocardial ischemia and necrosis. 6. Myocardial scintigraphy and some modern ancillary diagnostic tests are helpful in the diagnosis of myocardial infarction in pregnancy. Due to the number and location of infarcted myocardial injury, many symptoms and signs that may be similar to those in normal pregnancy can be found in the symptoms and physical examination observed clinically and need to be differentiated. 1. Symptoms. Decreased activity tolerance and dyspnea. 2. Signs. Peripheral edema, jugular venous anger, ectopic apical pulsations. 3.Heart auscultation. Split 1st and 2nd heart sound increments, 3rd heart sound (S3) gallop rhythm, jet murmur at left sternal border, continuous murmur (from breast vein murmur), non-pathological diastolic murmur has reached 10%. According to the above signs and symptoms, the dynamic evolution of ECG and cardiac enzymes should be regularly observed to help early diagnosis and timely treatment, but the following points should be noted. (1) T-wave inversion is often present in normal pregnancy. 5% of pregnant women may have pathological Q waves in lead III and an increased R/S ratio in lead V2. This is related to the elevation of the diaphragm and the change in heart position during pregnancy. (2) Glutathione transaminase (AST) activity may also be increased in pregnancy toxemia. (3) During delivery, CKP-MB may also be elevated to varying degrees depending on the mode of delivery, with a greater increase during cesarean delivery than during normal delivery.