Everything About Allergy

There are two main categories of the causes of allergy – host and environmental factors. Host factors are internal, like heredity, gender, race, age and heredity. Environmental factors are the external aspects such as exposure to infectious diseases in childhood, pollution, allergen levels and changes in diet.

Genetics play a big role in coping with allergy. Allergic parents will bear allergic children, twins are likely to have the same allergies. Racial factors may be associated with environmental factors and changes experienced by migrants. Early exposure to allergens increases the probability of developing allergy in childhood. Although exposure to bacteria and viruses in childhood is said to protect against the development of allergy.

(source: Wikipedia)