The manifestation is an excessive or premature contraction of the airway in response to various stimuli, causing airway spasm, mucosal edema and glandular hypersecretion, resulting in reversible narrowing of the airway. The clinical manifestations are recurrent episodes of expiratory dyspnea with croup. In an acute asthma attack, we should pay attention to: 1. Immediately remove from all possible allergic environment, provide a quiet, comfortable, temperature and humidity appropriate, air circulation environment. 2.Assist the patient (or yourself) to take a suitable position, such as semi-sitting or sitting, with support is preferable, which can reduce physical exertion. 3.If antiasthmatic aerosol has been applied, the application time should be recorded, and if there is no relief, timely medical consultation is required. After the onset of the application of rapid-acting bronchodilator beta agonist once, observe for twenty minutes, do not relieve can be used again, and then observe for twenty minutes, can try a third time, and then quickly seek medical attention. Second, in terms of food usually we need to pay attention to: 1, supply sufficient protein and iron. Diet should eat more lean meat, animal liver, tofu, soy milk, etc.. These foods are rich in high-quality protein and iron, to enhance the patient’s physical fitness, improve resistance to disease, and promote the repair of damaged tissues. 2, eat more food containing vitamin A, C and calcium. Foods containing vitamin A such as pig liver, egg yolk, cod liver oil, carrots, pumpkin, apricots, etc.; have the effect of moistening the lungs and protecting the trachea, foods containing vitamin C have anti-inflammatory, anti-cancer and anti-cold functions, such as dates, grapefruit, tomatoes, green peppers, etc.; foods containing calcium can enhance the ability of the trachea to resist allergies, such as pork bones, green vegetables, tofu, sesame paste, etc. It should be noted that dairy products can thicken the phlegm, not easy to discharge, and some people tend to have allergies to milk, so to limit the intake of milk and its products. 3.Increase fluid intake. A large amount of water will be lost from the respiratory tract after a wheezing attack, leading to dehydration of the body and thickening of the sputum, thus aggravating the bronchial spasm even more. Drink a lot of water to help dilute the sputum and keep the airway open; drink at least 2000ml of water per day (which includes water from food), while patients with cardiac insufficiency should be cautious. [or directly streamlined as; light, easily digestible, high-calorie, vitamin-rich soft food. Avoid eating hard, cold, fried foods. Intake more fresh vegetables, fruits and keep bowel movement smooth. Avoid eating allergy-prone foods, such as fish, shrimp, crab, eggs and milk, etc. Avoid irritating foods, such as pepper, ginger, etc.] Prevention of attacks 1. The living environment requires air circulation, freshness, suitable temperature and humidity. It is not advisable to place flowers and carpets indoors. It is not advisable to use feather pillows and quilts, and not to keep pets. Attention should be paid to avoid dust flying in the room or inhaling irritating substances. Clean the room frequently, wash the bedding, keep the room clean and sanitary, and reduce the contact with airborne allergens. 2. Avoid the use of drugs that may trigger asthma, such as aspirin, propranolol, indomethacin, etc. If you use them or need to use them, please inform your doctor. 3.Avoid the intake of food that causes allergy. Avoid the stimulation of cold air, quit smoking or avoid passive smoking, prevent respiratory infections, maintain a regular life and optimistic mood. 4.Patients need to carry antiasthmatic aerosol with them. When the aura of asthma attack appears, inhale it immediately and keep calm to control the symptoms quickly. 5.Patients should know the name of each drug they use. Patients should know the name of each drug they use, how to use it and the precautions to be taken when using it, the main adverse effects of the drug and how to take corresponding measures to avoid and reduce the adverse effects. 6.Follow the doctor’s instructions for medication.