Asthma is a chronic, inflammatory lung disease characterized by recurrent breathing problems. People with asthma have acute episodes where the air passages in their lungs get narrower, and breathing becomes more difficult. Sometimes episodes of asthma are triggered by allergens, although infection, exercise, cold air and other factors are also important triggers." rel="tooltip">哮喘是一种慢性Inflammation is the redness, swelling, heat and pain in a tissue due to chemical or physical injury, or to infection. It is a characteristic of allergic reactions in the nose, lungs, and skin." rel="tooltip">炎症引起咳嗽、胸闷、气喘或呼吸短促的肺部气道。
免疫治疗或Allergies are inappropriate or exaggerated reactions of the immune system to substances that, in the majority of people, cause no symptoms. Symptoms of the allergic diseases may be caused by exposure of the skin to a chemical, of the respiratory system to particles of dust or pollen (or other substances), or of the stomach and intestines to a particular food." rel="tooltip">过敏如果哮喘是由于接触不可避免的过敏原而引发的,或者如果症状每周出现三天,每月出现两天以上,就应该考虑注射。当症状常年出现或药物难以控制时,注射疫苗尤其有效。