Coronary arteries are three coronary arteries on the surface of the heart. A CT of the lungs that shows the word coronary calcification indicates that this chest CT incidentally sees the blood vessels on the surface of the heart during the examination. The presence of calcification of blood vessels indicates that there is narrowing inside the vessels, and patients with this condition should recall whether there are symptoms such as chest tightness and shortness of breath after activity. If the symptoms are not obvious, they can be temporarily observed and do not require special treatment or additional medication. If the patient has recurrent chest tightness, panic attacks, shortness of breath, especially related to activities, and the patient usually has bad habits such as smoking and drinking, is older than 45 years old, has abdominal obesity, and has an aggressive and impatient personality. If these risk factors are present, the patient should be considered as a risk group for coronary artery disease. At this time, coronary CT should be done to further determine how serious the calcification of blood vessels is and whether there is significant coronary stenosis, and if so, stenting should be considered.