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What is asthma? Asthma is a disease of the lungs and of the air tubes leading to them. Asthma causes the walls of the bronchioles (the tiny airways in the lungs) to swell and produce mucus so that it becomes difficult to breathe. The bands of muscle around the outside of the bronchioles tighten, further blocking the flow of air. What causes asthma and who is at risk? No one is sure what causes asthma, but the bronchioles of many people who have asthma are more sensitive than usual to certain triggers. Common triggers include: * Pollens and grass seeds * House dust and house dust mites * Tobacco smoke * Pollutants in the atmosphere * Changes in the weather * Respiratory infections such as a cold or a sore throat. Exercise, especially in cold weather, can trigger asthma in some people, as can emotional factors such as stress or anxiety. Asthma runs in...

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