Asthma attack caused many reasons, some obvious reasons, but, for some reason is often hidden, must work together to find doctors and patients rely on the patient and other family members in close contact should be for each episode in detail and find doctors discuss better.Induced Asthma, the following reasons for Directory known.
(1) allergic factors: 30% ~ 40% of bronchial asthma, to identify allergens. Mites, cat, dog skin scale, mold, pollen, milk, eggs, silk, feathers, moths, cotton, fungi are important allergens.
(2) non-specific physical and chemical factors, such as the inhalation of smoke, dust, and vegetable oils, smell like gasoline or paint, and the cold air, can stimulate sensory nerve endings in the bronchial mucosa, caused by reflex stimulation of vagus and cough , the airways hyperreactivity Based on the result of bronchial smooth muscle spasm.
(3), microbial infections: colds and infections of the upper respiratory tract are the most common incentives, winter and spring, or even more if the climate changes. Respiratory infections, especially infections more asthma attacks in children.
(4) Fatigue: a strong shock or prolonged physical work, intensive competitive sports may trigger asthma.
(5) psychological factors: mood swings can be an incentive. Such as anxiety, sadness, irritability can lead to asthma attacks and even laugh.
(6) occupational factors: These include a wide spectrum, such as the pharmaceutical industry, chemical industry workers to work on certain drugs or raw material allergy, allergy to certain drugs and other medical personnel.
(7) environmental factors, such as the cold season cold and easy to respiratory infections, or sudden changes in weather or pressure reduction may promote asthma.
The adverse effect of pregnancy on asthma
(1) during pregnancy because plasma cortisol and histamine enzymes increased, the situation can often reduce asthma symptoms or asthma conditions from pregnancy to improve the impact. Only 1 / 3 of patients worsen their condition.
(2) with severe asthma, pregnancy, almost half of patients with asthma situation worsened.
(3) recurrent episodes of status asthmaticus with the pregnancy there are 80% of asthma aggravated the situation.
(4) normal pregnancy serum immunoglobulin E (IgE was reduced), asthma, pregnancy and elevated serum IgE levels or prolonged, suggesting that the situation will likely worsen asthma.


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