Bronchial asthma is how the incidence

In everyday life, people often come into contact with can cause allergic materials such as leather, a sweater, plant pollen, fish, shrimp, seafood, Certain drugs, which to normal human would not cause any reaction, but right Allergies children, as allergens can trigger various allergies, the most common and most serious allergic reaction is bronchial asthma. Children come into contact with allergens, the body, has generated a specific antibodies, the human body is sensitized so that state, If later the same again contact allergens, it would be antigen-antibody reaction, some cells in vivo changes release some special bioactive substances (such as histamine, steamed bread reactive substances, 5-HT). These substances can occur strongly bronchial smooth muscle contraction and bronchial mucosa congestion, edema, increased secretions. Because smooth muscle cramps, the lumen become tighter, coupled with increased sputum, and very thick, filled bronchi, lung ventilation reduction in the volume of gas were not enough to feel the need to breathe hard, it will lead to asthma. Under normal circumstances, inspiratory tracheal lumen enlargement, breath when the contrary, once stenosis and breath difficulties will arise. So children with asthma breathing difficulties to breath difficulties characteristic.