A left anterior descending midmyocardial bridge is a segment of the left anterior descending coronary artery of the heart that travels inside the myocardium due to congenital vascular anatomical anomalies. Left anterior descending branch is a branch of the coronary artery of the heart, the vast majority of people’s coronary arteries traveling in the epicardium, there are a small number of people due to congenital vascular developmental anomalies, a section of the coronary arteries traveling in the myocardium, because of the section of coronary arteries covered by the myocardium above the shape of the cardiac muscle is like a bridge, and therefore is called “myocardial bridge”. If the left anterior descending myocardial bridge is shaped under the superficial myocardium and the shaped section is short, it is generally asymptomatic and does not affect the blood supply to the myocardium; if the shaped section is deeper and the shaped section is longer, myocardial ischemia and angina pectoris symptoms may occur. This is because the coronary arteries under the myocardium are compressed during cardiac contraction, which reduces the blood flow to that part of the coronary arteries leading to local myocardial ischemia. If you have a myocardial bridge please visit the hospital and ask your doctor to assess the situation and seek prompt medical attention if you feel unwell.