Asthma
What is asthma? Asthma is an episodic constriction of the bronchial tubes. It is a common disorder of both children and adults, often regarded as mysterious and frustrating to treat. What are the symptoms of asthma ? The condition is marked by wheezing (especially on expiration), coughing, and difficulty in breathing. Asthma can appear and disappear without warning. If an attack is severe enough, it can kill. What are the causes of asthma ? The immediate cause of an asthmatic attack is tightening of the muscular bands that regulate the size of the bronchial tubes. These muscles are controlled by nerves, but what triggers the nerves to make airways constrict inappropriately is not clear. The triggers for asthma can be primarily allergic or primarily emotional or induced by exercise or respiratory infection, or it can occur with no obvious causes. It is now being considered an inflammatory disorder. The "hygiene hypothesis" is a proposed explanation for why allergie...
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Nice article