| An allergy is an unusual or exaggerated response within the body towards substances normally harmless to others. An allergic reaction is simply an improper response of the immune system to an otherwise harmless substance such as foods, vitamins, medications, pollen, flowers, weeds, grasses, trees, dust, formaldehyde, plastics, metals, cats, dogs, fabrics, chemicals, heat, cold, etc. |
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| An allergic person can react to any substance around him and produce any usual or unusual health problems involving any and every parts and organs of the body or it can impair any functions of the body. |
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