Mild stenosis of the anterior descending branch, if there is no stenosis in other blood vessels and the patient does not have uncomfortable symptoms such as chest tightness and chest pain, it means that it has not caused ischemia and is usually not serious. However, if the anterior descending branch vasospasm, or vascular plaque instability, even mild stenosis, may cause severe myocardial ischemia, causing serious events, dangerous, then it is serious. Mild stenosis of the anterior descending branch, generally does not affect the coronary artery blood supply, will not cause myocardial ischemia, not serious, in this case you need to pay attention to quit smoking and alcohol, low-salt and low-fat diets, etc., to control the blood pressure, blood glucose and lipids, and try to avoid aggravation of vascular stenosis. Even if the anterior descending branch is mildly stenotic, if the vascular plaque is unstable and the plaque surface ruptures, platelets may gather to form thrombus, blocking the blood vessel, or spasm occurs in the stenotic blood vessel here, which may lead to the interruption of the blood flow, resulting in the distal myocardium ischemia and hypoxia, or even myocardial infarction, which is life-threatening, and this would be very serious. Whether mild stenosis of the anterior descending branch is serious or not needs to be combined with whether or not the patient has symptoms of myocardial ischemia, and when there are symptoms, it is necessary to go to the cardiology department in a timely manner.