The grading of emergency patients is usually divided into four levels in clinical practice: the first level is called frequency critical patients, these patients may be lifeless at any time, such as no breathing, no pulse, no consciousness, these patients must be immediately sent to the resuscitation room to rescue; the second category is called critical illness, critical patients come to the hospital, it is possible that the respiratory circulation is relatively stable, but the patient’s symptoms are particularly serious, such as consciousness is very fuzzy The third category is called acute illness, this type of patient is temporarily will not appear in a short period of life-threatening symptoms, but this type of patient in the hospital observation and treatment of abnormalities, but also to adjust the first class; the fourth category is non-acute illness, that is, the patient does not have the symptoms of acute morbidity, and rarely complain of any discomfort. Patients who rarely complain of any discomfort and do not require emergency treatment in clinical judgment.