Patients with bronchial asthma may often experience acute asthma attacks, but the severity of each attack varies. Mild bronchial asthma attacks may resolve quickly on their own or with medication, while more severe asthma attacks require prompt medical attention and aggressive treatment. A preliminary estimate can first be made by changes in self-conscious symptoms. The severity of an acute asthma attack can usually be classified into four categories: mild, moderate, severe and critical according to symptom performance: 1. Mild bronchial asthma: mild self-conscious symptoms, shortness of breath only when walking, free position, can lie down, can talk continuously, only a slight croup can be heard, breathing is slightly short, but emotions are still quiet or slightly anxious. 2.Moderate bronchial asthma: feel shortness of breath and difficulty, especially when there is a little activity, like to take a sitting position, short speech when talking, can hear rales, shortness of breath, sometimes emotional anxiety and irritability, and sweating phenomenon. 3.Severe bronchial asthma: Breathing difficulty is very obvious, even at rest, shortness of breath and increase in speed, when sitting in a forward leaning position, only a fragment of speech can be issued, and extensive croup can be heard. There is often emotional anxiety and irritability, and sweating profusely, and even blue lips and nails. 4.Critical: drowsiness, or even blurred consciousness, etc. occur. Bronchial asthma is a disease of airway allergic inflammation and airway hyperresponsiveness. Severe asthma attacks can last for more than 24 hours and those who cannot be relieved by general treatment are called asthma persistent state. At this time, patients exhibit dyspnea, prolonged expiration, coughing, pale or purple face, and increased heart rate, often above 120 beats per minute. In severe cases, blood pressure drops, sweating profusely, emphysema appears, and confusion and coma may occur. Emergency treatment can be done in the following ways according to different situations: 1. Assist the patient to take a sitting or semi-recumbent position to rest; or let the patient hold a pillow and kneel on the bed, leaning forward at the waist, this position is favorable for the patient to breathe. 2, quickly remove the home oxygen bottle, with a high flow rate of 3 liters per minute oxygen through the nasal cannula or mask to the patient inhalation. 3, pay attention to patient warmth, quiet environment, encourage patients to cooperate with treatment. 4.Ventilate the room with fresh air, but there should not be any over wind. Avoid kerosene, smoke, paint and other irritating gases in the room. 5.Initial treatment: Inhale short-acting B2 agonist 1-3 sprays, repeat inhalation once in 20-60 minutes if necessary. (1) Good response: slight wheezing, coughing, dyspnea or chest tightness; symptoms only when active, no symptoms at rest; repeat treatment every 3-4 hours as needed within 24-48 hours; continue routine anti-inflammatory treatment; contact doctor if symptoms recur; continue routine evaluation of condition; routine treatment according to individualized treatment plan; contact doctor for follow-up. (2) Fair response: significant wheezing, dyspnea or recurrent cough; symptoms occur even at rest; inhale B2 agonist every hour; start oral glucocorticosteroids according to treatment plan; seek medical attention if symptoms do not resolve within 2-6 hours; continue evaluation; fair response; go to hospital emergency or contact doctor if symptoms worsen. (3) Poor response: severe wheezing and dyspnea, intermittent speech; severe symptoms at rest; contact the hospital for emergency care or go directly to the hospital emergency room for treatment. Before the arrival of the ambulance doctor, or before going to the hospital, closely observe the condition and instruct the patient to inhale aerosol, administer oxygen and take medication. For those who are escorted to the hospital by family members, the symptoms should be basically relieved, with clear consciousness, blood pressure within the safe range, uninterrupted oxygen intake, and direct to the emergency room for emergency treatment by a doctor.