Asthma
Asthma is a condition in which your airways narrow and swell and produce extra mucus. This can make breathing difficult and trigger coughing, wheezing and shortness of breath.For some people, asthma is a minor nuisance. For others, it can be a major problem that interferes with daily activities and may lead to a life-threatening asthma attack.
The airways are tubes that carry air into and out of your lungs. People who have asthma have inflamed airways. The inflammation makes the airways swollen and very sensitive. The airways tend to react strongly to certain inhaled substances. When the airways react, the muscles around them tighten. This narrows the airways, causing less air to flow into the lungs. The swelling also can worsen, making the airways even narrower. Cells in the airways might make more mucus than usual. Mucus is a sticky, thick liquid that can further narrow the airways. This chain reaction can result in asthma symptoms. Symptoms can happen each time the airways are inflamed.

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Causes:
The exact cause of asthma isn’t known. Researchers think some genetic and environmental factors interact to cause asthma, most often early in life. These factors include:
1. An inherited tendency to develop allergies
2. Parents who have asthma
3. Certain respiratory infections during childhood
4. Contact with some airborne allergens or exposure to some viral infections in infancy or in early childhood when the immune system is developing.
Asthma affects people of all ages, but it most often starts during childhood. Young children who often wheeze and have respiratory infections—as well as certain other risk factors—are at highest risk of developing asthma that continues beyond 6 years of age

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