In the late stage of cancer, there will be systemic spread of tumor cells, which will cause heart failure, long-term malnutrition leading to heart failure or cancer complicating lung infection and drug-induced myocardial side effects, which will cause the patient’s death. Malignant tumors will metastasize with blood and so on in the late stage. When malignant tumors have systemic metastasis or metastasis around the heart, it will lead to serious damage to the patient’s heart function, thus causing symptoms of heart failure. In some patients, with the development of cancer, malignant tumor cells will seriously damage various organs of the patient’s body, resulting in impaired organ function, thus causing symptoms of myocardial failure. Cancer must follow the principle of early detection and early treatment, and early treatment through surgery. If heart failure occurs in the late stage of cancer, the patient must go to the hospital for effective treatment in time to avoid life-threatening situations and try to prolong the patient’s life. Heart failure can cause death in serious cases, so when patients develop heart failure symptoms, they should be treated in time.