Cardiology, also known as cardiovascular disease, should be consulted for cardiac problems. Common diseases in cardiology include arrhythmia, cardiomyopathy and coronary artery disease. According to different diseases, the doctor will guide you to choose the appropriate auxiliary examination, and then choose different treatments according to the results of the perfect examination, as follows: 1. Among the common diseases, arrhythmia patients will show panic, palpitations or a feeling of emptiness in the heart, and the examination of arrhythmia should be done by electrocardiogram or 24-hour dynamic electrocardiogram monitoring to clarify the nature of arrhythmia and the number of arrhythmias; 2. In addition, the nature of the arrhythmia and the number of arrhythmias should be clarified. 2. Cardiomyopathy is also relatively common in cardiology, and patients will have symptoms of cardiac insufficiency, dyspnea, sedentary breathing or swelling of the limbs. Suspected of heart failure, cardiac insufficiency to check the cardiac ultrasound, test the size of the chambers of the heart and the ejection capacity; 3, coronary heart disease is also relatively common in the Department of Cardiology, the typical symptom is angina pectoris, when serious, it can be manifested as a myocardial infarction, the patient will appear in the anterior region of the heart pain, taking nitroglycerin or cardiac pills can be relieved, if the persistence of non-relief, to be vigilant about whether there is the occurrence of a heart attack. The gold standard for detecting coronary heart disease is coronary angiography, and in the absence of conditions, coronary CT and cardiac enzymology can also be done, which can assist in diagnosis.