asthma

Asthma, also known as asthma. The patient feels strenuous when breathing, which is caused by airway smooth muscle spasm. Pneumonia, heart failure, chronic bronchitis and other diseases often have this symptom. Patients with trachea have bronchial allergies and will respond to a little irritation. After stimulation of the bronchus, it will cause contraction, bronchial mucosa enlargement, mucous membrane and secretion of mucus. After a series of actions, the inner diameter of the bronchus will become narrow. As a result, only a small amount of air can pass through, which causes wheezing and difficulty breathing.