What Causes Asthama?

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Nobody really knows what causes asthma,but the tendency to develop it frequently seem to be inherited.During the attacks,the airways become swollen,excess mucus plugs these narrow passages,and the muscles lining the airway tighten up.Children and adults may experience coughing ,wheezing,chest tightness,increase heart rate,perspiration and shortness of breath. Asthama is strongly associated with pollution.The incidence of asthama has risen sharply in the last thirty years,along with a rise of industrialization and higher levels of environmental pollution. Other possible causes of asthma in vulnerable individual include allergic reaction to dietary substances like wheat,dairy products,chocolate,nuts,preservatives and other chemical food and beverage additives.Asthma attacks may also be brought on by pollen,house dust mites,tobacco smoke,features and other allergens.Even temprature change,or cold morning air can cause a broncho spasm and increase the likelihood of an attack.In some individuals,anxiety can precipitate an asthma attack and stress,therefore,is a contributory factor. There is a strong hereditary link and asthma can often been seen to run in families.Children who lives in houses with smokers are also at higher risk for developing asthma at any time in their lives........