Asthma
is a long-lasting (chronic) disease of the lungs and airways (bronchi)
that affects 5 people in every 100. In children, this figure is higher
and rising.
Asthma is characterised by attacks of breathlessness, tight chest, wheezing and coughing which are caused by the airways becoming narrowed and inflamed. Some people may have these symptoms all of the time and others may be normal between attacks.
Asthma is characterised by attacks of breathlessness, tight chest, wheezing and coughing which are caused by the airways becoming narrowed and inflamed. Some people may have these symptoms all of the time and others may be normal between attacks.
How do you get asthma?
Asthma can arise at any age, but why some people have the disease and others don't is not known. People with asthma have airways that are more sensitive than normal.- Doctors know, however, that asthma can sometimes run in families.
- Asthma attacks can be set off by many different things, these are called triggers. Examples include cold air, vigorous exercise and stress.
- These triggers may also include 'allergens'. These are present in the environment and contain chemicals that trigger allergic reactions.
- Allergens include, for example, pollen, animal danders, house dust, pollution, some foods, perfumes and cigarette smoke.
- Allergens cause the lining of the airways to become swollen and inflamed. It produces extra mucus and the muscles of the airways tighten. There is then less room for the air to pass in and out.
- Attacks may be more frequent or severe in people who have a chest infection.
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