2, wheezing and dyspnea: It is a typical symptom of asthma, and the onset of wheezing is often sudden. Dyspnea is expiratory dyspnea, which is characterized by short inspiratory time and long expiratory time. Patients feel hard to exhale, but some patients feel hard to exhale and inhale.
3. Cough and expectoration: Cough is a common symptom of asthma, which is caused by airway inflammation and bronchospasm. A dry cough is often a precursor to asthma. When asthma attacks, the symptoms of cough and expectoration are alleviated, mainly wheezing. Towards the end of the asthma attack, bronchospasm and airway stenosis were relieved. When a large amount of airway secretions need to be removed, coughing and expectoration may be aggravated, and a large amount of white foam sputum may be coughed up. There are some asthma patients whose acute asthma attack is mainly characterized by irritating dry cough without obvious wheezing symptoms. This part of asthma is called cough variant asthma.
4. Chest tightness and chest pain: When asthma attacks, patients may feel chest tightness and tightness in the chest. If the asthma attack is serious, it may be related to excessive fatigue and strain of respiratory muscles. Sudden chest pain should consider the possibility of spontaneous pneumothorax.