Coronary heart disease is the abbreviation for coronary atherosclerotic heart disease. It refers to the narrowing or blockage of the coronary artery vessels due to arteriosclerotic lesions, causing myocardial ischemia, hypoxia, or necrosis, leading to heart disease. Its attacks are often related to seasonal changes, emotional excitement, increased physical activity, overeating, heavy smoking, and drinking. When sudden coronary heart disease occurs, the first step is to eliminate these triggering factors, such as immediately calming down when emotionally agitated, or immediately resting in bed if active. Rest should be the priority. If resting and removing triggers do not relieve symptoms, sublingual administration of nitrate and rapid-action heart-saving pills can be used; generally, these medications can relieve symptoms. If relief is still not obtained, it is advised to seek medical attention promptly nearby. In cases of sudden unbearable pain, a sense of impending death, and intense pain despite taking rapid-action heart-saving pills, it is advised to call emergency services (dial 120) immediately to compete for time to prevent acute myocardial infarction, where emergency surgery might be available.