Heart disease is a major type of disease that occurs in the heart. Different diseases have different manifestations and the methods required for examination are also different, and the main common examination methods for heart disease in general are electrocardiogram (ECG), cardiac ultrasound (ECHO), coronary CTA, and blood-related indexes. 1. Arrhythmia: patients may not have any obvious discomfort, or may have symptoms such as panic, fatigue, sweating, etc., which can be detected by general electrocardiogram, 24-hour dynamic electrocardiogram, and so on. 2. Myocardial infarction: patients usually have chest tightness, chest pain, the pain site is not fixed, there may be radiating pain on the back of the shoulder and other manifestations, which can be detected by electrocardiogram, blood cardiac infarction three indexes, cardiac ultrasound, coronary artery CTA or angiography and so on. 3. Heart failure: patients may have no obvious symptoms in the early stage, and aggravation will cause chest tightness, shortness of breath, cough and sputum, lower limb edema, etc., which can be detected by lung auscultation, B-type natriuretic peptide index, cardiac ultrasound and so on. It is recommended to go to the hospital in time when the patient has similar symptoms, so as to clarify the cause of the disease and then reasonably treat it.