If the patient has chest tightness and dry mouth consider that the patient may have coronary artery disease, diabetes mellitus or an associated abnormality in glucose tolerance. Patients are advised to have a chest X-ray, electrocardiogram and cardiac ultrasound, as well as a fasting blood glucose test, which can be combined with a glycated hemoglobin to help assess the patient’s overall blood glucose fluctuations over 8-12 weeks. If the patient’s symptoms are relieved by sublingual cardiac pills or nitroglycerin during the onset of chest tightness, the patient should be able to take a heart pill or nitroglycerin. Patients with coronary artery atherosclerotic heart disease are highly considered, and if necessary, coronary CT examination is recommended to further clarify whether the patient has coronary heart disease and the severity of coronary heart disease. If abnormal blood sugar is present, treatment should also be combined with oral hypoglycemic drugs or subcutaneous insulin injection.