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Allergies
How is it diagnosed?
Diagnosis of allergies is usually straightforward although it may sometimes be difficult and time consuming. In general, there is a period of exposure prior to development of symptoms during which sensitisation occurs. Only a proportion of sensitised (atopic) people go on to develop symptoms (allergies) following re-exposure to the allergen. For example, egg and milk allergy commonly occur in infancy when exposure to these foods is most common. Allergic asthma occurs later in childhood following exposure to inhalant allergens including house dust mites and animal danders, whereas hayfever peaks in adolescence/early adulthood following repeated exposure to seasonal pollens, the 'Allergy March.'
What are the causes?
| Inheritance patterns and prenatal diagnosis 
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