Allergy is immune-system response to a particular food, airborne substance, chemical, medication, cosmetic, perfume, textiles, building material, or plastic. Some symptoms of allergy include:

    Itchy, watery eyes
    Sneezing
    Headache
    Runny or stuffy nose, or postnasal drip
    Sore throat
    Dark circles under the eyes
    Itchy feeling in the mouth or throat

Self-care for allergy can be approached in a number of ways. To make it easier, doctors recommend trying these simple steps first:

    Watch what you eat
    Work with a professional who specializes in food sensitivities to see if certain foods are causing your allergy
    Clean it up
    Control household allergens like dust, mold, and animal dander to reduce your overall allergic load
    See an allergist
    Find a health professional to help you manage your allergy
    Help children avoid allergy with beneficial bacteria
    Take a supplement containing high-potency beneficial bacteria (probiotics) during pregnancy and give them to newborns to help reduce the risk of children developing allergy

Source: Vitacost.com