When patients with coronary artery disease develop coughing symptoms, further tests are needed to diagnose heart failure. Heart failure is a group of clinical syndromes caused by abnormal changes in the structure and/or function of the heart, resulting in impaired ventricular systolic and/or diastolic function. Heart failure can lead to pulmonary edema or pulmonary stasis, and its clinical manifestations include coughing and coughing up pink foamy sputum, etc. Although coronary artery disease can cause heart failure, it doesn’t mean that a patient with coronary artery disease who has a cough can be diagnosed as having combined heart failure, and coughing symptoms can be seen in many diseases, such as respiratory tract infections. For further diagnosis, patients need to do some auxiliary tests, such as natriuretic peptide and troponin test, electrocardiogram, chest X-ray, echocardiography, etc.; when the above tests show an objective basis for heart failure, combined with the patient’s symptoms can be diagnosed. Patients are advised to go to the hospital for further examination to clarify the cause of the disease.