The causes of cardiac hemangiosarcoma are not particularly clear at present, and may be related to cardiovascular health conditions, heredity, environmental pollution and other factors. 1. Cardiovascular health condition: local atherosclerosis, vascular trauma or bacterial infection in connective tissues may stimulate local cell proliferation or lead to degeneration and brittleness of blood vessels, which may lead to the attack of angiosarcoma. 2. Heredity: research shows that cardiac angiosarcoma has certain heredity. When there are immediate family members suffering from cardiac angiosarcoma or long-term high blood pressure, high blood fat and other underlying diseases, it will increase the possibility of one’s own suffering from cardiac angiosarcoma. 3. Environmental pollution: besides the environmental influence during pregnancy, cardiac hemangiosarcoma may also be caused by long-term exposure to polluted environment or high radiation in daily life. Cardiac angiosarcoma is a kind of rare malignant tumor, once diagnosed, one should actively seek medical treatment to avoid missing the best treatment period.