Younger breast cancer patients are increasingly being treated, most must receive chemotherapy and at relatively high doses in order to prevent recurrence and metastasis. The most common chemotherapy regimen currently used is cyclophosphamide + epi-amycin + paclitaxel. Cyclophosphamide: Conventional doses to the cardiovascular system can cause cardiomyopathy, focal wall-piercing myocardial hemorrhage and coronary arteritis. High doses can cause hemorrhagic myocardial necrosis and heart failure after 2 weeks of the last dose. Paclitaxel: Transient tachycardia and hypotension are more common and generally do not require treatment. However, close observation should be made during the first hour of titration to watch for allergic reactions. Severe conduction block occurs in some patients. Heart failure may occur in severe cases of cardiotoxicity. Epi-Amycin: can cause myocardial damage and heart failure. This heart failure can occur even weeks after termination of therapy and may be ineffective to the appropriate drug therapy; the potential risk of epiampicin cardiotoxicity may be increased in patients who are currently or previously treated with combined radiation therapy to the mediastinal and pericardial regions. All three drugs have some cardiotoxicity, so electrocardiograms should be performed before and after each course of treatment. Cardiomyopathy caused by anthracyclines, especially adriamycin, is manifested on ECG by persistent low voltage in QRS wave clusters, prolongation of inter-systolic intervals beyond the normal range, and reduced ejection fraction. Cardiac monitoring is very important in patients undergoing chemotherapy and cardiac function can be assessed by non-invasive techniques such as electrocardiogram and echocardiogram. After chemotherapy, many patients are left with toxic cardiac side effects, which manifest as palpitations, shortness of breath after activity, premature beats and ST-segment changes on ECG, which seriously affect the quality of life. Many of the patients who came to the outpatient clinic had the above-mentioned symptoms significantly reduced or even disappeared after being treated with herbal prescriptions. Patients after chemotherapy for breast cancer are especially reminded that it is best to adhere to oral Chinese medicine for a period of time to regulate and resolve the discomfort of heart symptoms.