The most common factor is hypoxia. In chronic bronchial dilatation, chronic bronchitis, chronic obstructive pulmonary emphysema, chronic pulmonary heart disease, and even the formation of pulmonary hypertension, the body will have insufficient arterial oxygen saturation, high partial pressure of carbon dioxide, and low partial pressure of oxygen, which will lead to hypoxia. 2. In people with hyperlipidemia, such as hypertriglyceridemia and hypercholesterolemia, there are often clinical symptoms and manifestations such as drowsiness and weakness due to high blood lipid level. 3. In patients with inadequate blood supply to the heart, such as coronary atherosclerotic heart disease, there are often clinical symptoms and manifestations such as chest tightness, shortness of breath, fatigue, drowsiness and weakness.