If the patient currently has chest tightness with dry mouth, this condition may be considered to be due to the presence of abnormal glucose tolerance or the presence of diabetes itself. This precordial discomfort can be induced by the current unstable blood sugar control. In addition to this, it can also cause the patient to have dry mouth. In other patients, the dry mouth may occur due to the use of specific medications, which can also cause dry mouth. Chest tightness may be caused by patients with coronary artery disease or angina pectoris, which makes them relatively prone to this precordial discomfort. Patients are advised that blood glucose, glycosylated hemoglobin, chest X-ray, electrocardiogram and cardiac ultrasound should be taken if necessary to help further clarify the diagnosis. There are many diseases that cause chest tightness, such as diseases like hypertrophic obstructive cardiomyopathy, congenital heart disease, myocarditis, and stenosis of the aortic valve. All of these causes can lead to chest tightness. Dry mouth may also be caused by low humidity in the climate, and patients are advised to install a humidifier indoors.