The onset of asthma commonly takes place in childhood, but it can start at any age. For most children with asthma (about 80 percent), and for more than half the adult sufferers, there is an allergic basis for their disease – this means that being in contact with a specific allergen makes their symptoms worse. This exposure may occur only periodically, such as when you visit the home of a cat-owning friend, or it can be continuous, as with the allergens resident in your home. Common allergens in the home are those relating to house-dust mites, cockroaches, and to pets.
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