The symptoms of bronchial asthma are episodic and recurrent. The main symptom is the appearance of wheezing, which may also be accompanied by cough, chest tightness, chest tightness and shortness of breath. Wheezing is often sudden and episodic with croup, and intermittent asthma attacks are usually asymptomatic. Inhalation during an attack is still relatively smooth, but exhalation is very difficult, and in severe cases there is shrugging of the shoulders. These are the most important characteristics of asthma symptoms. The main causes of bronchial asthma are immune abnormalities, environmental pollution, diet, drugs, climate change, respiratory infections, exposure to allergies, dusty environment, smoking, etc. All of them may cause asthma as allergens and need to avoid triggering factors in life. Sudden onset of chest tightness, coughing and wheezing when exposed to allergens. You need to get rid of the allergen as soon as possible. Some of them will be relieved on their own, but some of them need to use medication to relieve or control them. This is the main clinical manifestation characteristic of asthma. Treatment measures are mainly based on inhaled glucocorticoids, which can be combined with bronchodilators. Patients with indications can also be treated with desensitization. It is important to note that asthma is a chronic disease that requires long-term treatment and should not be interrupted at will, otherwise there is a risk of acute attacks.