Sweating in heart disease can be caused by coronary heart disease, heart failure, arrhythmia and other diseases. 1. Coronary heart disease: coronary artery stenosis or occlusion, resulting in myocardial ischemia and chest pain, chest tightness and other discomforts. Acute coronary syndrome occurs, in addition to the typical angina symptoms, but also accompanied by toothache, shortness of breath intensified, the sudden emergence of cold sweat and so on. 2. Heart failure: heart function is impaired due to various reasons, resulting in cardiac blood output cannot meet the basic metabolism of the whole body tissue. Acute heart failure is characterized by sudden and severe dyspnea, grayish color and sweating. 3. Arrhythmia: irregular heartbeat caused by abnormalities in the electrical conduction system of the heart, many patients are asymptomatic or have mild symptoms in the early stage, and with the development of the disease, the patient will experience palpitations (rapid heartbeat, often accompanied by panic), fatigue, sweating and other symptoms. If heart disease patients have symptoms of unexplained sweating, they should seek prompt medical attention to clarify the cause of the condition and actively cooperate with treatment.