The causes of heart thrombosis are as follows: 1. It may be due to various risk factors such as hypertension, diabetes, smoking, etc., which cause damage to the cardiovascular endothelium, which will stimulate the coagulation system and produce thrombosis. 2. It may be due to elevated blood lipids, especially elevated LDL cholesterol, which leads to the formation of plaque in the blood vessels, and when the plaque increases to a certain degree, there is a risk of shedding, and the shedding plaque will enter the blood circulation. When the plaque reaches the small blood vessels, it will cause local blockage. 3, some thrombi come from patients with atrial fibrillation, the heart due to atrial fibrillation, hemodynamic changes, it will form atrial thrombus, so the active treatment of atrial fibrillation is also a program to eliminate thrombus. Blood clots are very harmful to the human body, if blocked cardiovascular will lead to myocardial infarction, blocked cerebral vessels will cause brain infarction, blocked pulmonary vessels will cause pulmonary embolism, etc. In order to prevent thrombosis, usually low salt, low fat diet, control the risk factors, patients without bleeding tendency can usually take small doses of aspirin, which has a certain anti-platelet aggregation effect.