Patients who get up in the morning with a little tightness in the chest usually have to consider cardiogenic diseases, such as coronary artery disease unstable angina, or myocarditis, or patients with pericarditis, valvular disease of the heart, rheumatic heart disease, arrhythmias caused by various factors, or chronic heart failure, will have symptoms of chest tightness, shortness of breath, and discomfort in the precordial region when they get up in the morning. In addition, if patients develop chronic pulmonary insufficiency, such as chronic bronchitis, chronic bronchiectasis, chronic obstructive pulmonary emphysema, and pulmonary hypertension, then patients will have decreased arterial oxygen saturation and insufficient partial pressure of oxygen, and will also have clinical symptoms and manifestations of chest tightness and shortness of breath when waking up in the morning. Finally, if patients develop endocrine metabolic diseases, often in thyroid insufficiency and adrenal insufficiency, they have the above-mentioned manifestations.