The change of the environment of rural urban society. City people spent most of his time in a home or office with air conditioning. Don"t exercise, the body weak, infected easily. As people turn to eat fast food more and more. The intake of incomplete. Foreign object into the body and get more and more, such as colors, preservatives, etc., for ปัจจัยอื่นๆ. For example, pollution from industry. Traffic, smoking, etc. These are called environmental allergen at all. So most people, but some take allergens into the body over time. Get more stimulate the body to allergy.
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