Asthma is also known as bronchial asthma. Bronchial asthma is a chronic inflammatory disease of the airways involving multiple cells and cellular components. This inflammation is often accompanied by increased airway reactivity, resulting in recurrent episodes of wheezing, shortness of breath, chest tightness, and/or coughing, mostly at night and/or in the early morning hours. Symptoms of asthma Episodic expiratory dyspnea with croup or episodic cough and chest tightness. In severe cases, the patient is forced to sit or breathe in a sitting position, coughs dryly or coughs up large amounts of white foamy sputum, or even develops cyanosis. In some adolescent patients, chest tightness, cough and dyspnea during exercise are the only clinical manifestations (exercise asthma). Asthma symptoms may come on within minutes and resolve over hours to days with bronchodilators or on their own. Some patients may have a relapse after a few hours of remission. Nocturnal and early morning attacks and exacerbations are often a feature of asthma. How to prevent asthma? 1. Diet Patients with asthma should eat a light, nutritious soft diet, not spicy, too sweet, too salty or irritating food, and eat small and frequent meals. Eat more vegetables and fruits and foods with high calcium content, but when consuming seafood for calcium, attention should be paid to anti-allergy. Asthma patients should also drink more water, which is conducive to the elimination of sticky phlegm. 2, quit smoking Smoking is one of the important factors causing asthma, smoking can stimulate the respiratory tract to trigger an attack, so asthma patients must quit the habit of smoking. It is also important to avoid inhaling second-hand smoke. 3.Indoor environment Indoor air should be kept clean and circulating, because microorganisms in the air are the main cause of asthma, the formation and attack of asthma is related to repeated respiratory infections, because bacterial and viral infections can directly damage the respiratory epithelium, resulting in increased respiratory reactivity, so avoid respiratory infections can effectively reduce the recurrence of asthma. 4, appropriate exercise Many people worry that exercise will trigger asthma, so they stop all activities, this idea is wrong, asthma patients consult a doctor before exercise, can be appropriate for walking and deep breathing exercise. When going out, pay attention to the cold and keep warm, and avoid entering public places with bad environment. 5.Prevention of external sensation promotion Asthma patients should find out which substances will stimulate their respiratory tract and try to avoid contact with occupational allergens and other non-specific irritants, such as common foods that cause allergies, such as fish and crabs, eggs, milk, etc. Other allergens that easily blanket the onset of disease, such as wool and stuffed toys, patients should also try to avoid contact. 6.Lifestyle Asthma patients should maintain a combination of work and rest, avoid excessive exertion, and maintain a good state of mind.