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The word "allergy" did not exist in Shakespeare's time or even a hundred years ago. It's a modern term for a modern illnessor, more accurately, an assortment of illnesses. Allergy is a catchall word for a variety of reactions made by the body when it detects something foreign. The offending substances may be foods, animal dander, house dust, pollens, mold, smoke, air pollution, medicines or chemicals. The ability of the immune system to identify individual substances and react to them is crucial, but overreaction creates uncomfortable symptoms such as sneezing, sinus congestion, itching or watery eyes, headaches, indigestion, skin rashes, hives and other symptoms. |
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At any time of year, it can be hard to tell the difference between allergies and cold symptoms. Either can produce sneezes, a runny nose, nasal congestion, an itchy throat and irritated cough. If a "cold" lasts for several weeks, and if your symptoms seem more severe in certain locations (less intense outdoors in winter, for example, and worse in certain rooms or buildings), it's probably hay fever. |
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According to allergy researchers, indoor or year-round allergies are almost always due to three sources of irritation: |
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