A 20% stenosis of the left anterior descending branch is a requirement for medication. Although the stenosis is not severe, the progression of the disease should be prevented by applying medication, and attention should be paid to the prevention of risk factors in addition to taking medication. Anterior descending stenosis of 20% is a mild stenosis and should be treated with secondary prevention drugs as prescribed by the doctor. Commonly used are anti-platelet aggregation drugs such as aspirin, lipid-lowering plaque stabilizing drugs such as atorvastatin or pitavastatin, ventricular rate control drugs such as metoprolol. Hypertension, hyperlipidemia and hyperglycemia require symptomatic application of antihypertensive. Lipid-lowering. Hypoglycemic drugs. In addition to medication must prevent risk factors, diet low salt and low fat diet, eat more vegetables and coarse grains, improve bad habits, quit smoking and drinking, less late at night, strengthen aerobic exercise, weight control. If there is panic, chest tightness, chest pain and other angina symptoms attack, it is recommended to go to the cardiology department as early as possible.