A common disease means a disease that is more common in clinical practice, not a rare disease or a very rare disease. A common clinical disease, there is coronary heart disease, which belongs to coronary atherosclerotic heart disease, it often manifests as pain in the precordial region, and even myocardial infarction, which often has different manifestations when checking blood lipids as well as checking electrocardiogram, and the electrocardiogram will have T-wave inversion, and there is insufficient blood supply to the heart muscle. Another common disease, such as diabetes mellitus. In diabetes, the patient’s blood sugar tends to be elevated, and he or she will experience thirst, dry mouth, drinking more water, and will appear to lose weight. In diabetes, it is important to pay attention to proper diet control, eat less white rice, white noodles and exercise properly, and consider metformin for treatment.