Al­ler­gic dis­eases in­crease the risk of adult-on­set asthma.

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A Finnish study found that the more allergic diseases an individual has, the higher the asthma risk. The number of allergic diseases increases the risk of adult-onset asthma especially in individuals born after 1940, according to a study published in the Allergy journal. Approximately one in ten Finns suffers from asthma. It is one of the most common chronic illnesses in Western countries. Allergy is a risk factor in childhood asthma but its significance to adult-onset asthma is not precisely known.

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