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To become allergic a person must have a genetic predisposition for allergy and must be exposed to sensitizing allergens. Most allergies begin in early childhood, and early environmental factors play a major role in the development of allergies.
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Food allergies can cause a host of symptoms , including : swelling of the lips; tongue or throat; hoarseness; cough; hives ; skin rashes ; a runny nose and watering eyes; and asthma . Sometimes symptoms are limited to nausea, vomiting, or cramping diarrhea. Symptoms of a food allergy are highly individualistic and usually begin within minutes to a few hours after having eaten the offending food.
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Non-Allergic Rhinitis: This type of rhinitis is not as well understood. Although not triggered by allergy, the symptoms are often the same as seen with allergic rhinitis. Allergy skin test results are negative. Nasal polyps may also be seen with this type of rhinitis.
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