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Over the past 30 years, there's been a worldwide increase in all kinds of allergies, and everything from air pollution and climate change to the overuse of antibiotics has been implicated. Researchers don't fully understand why some substances trigger allergies and others don't, or why some people are highly allergic and others are symptom-free. Read on to learn more about asthma and allergies, if your symptoms match up, and how to treat them.
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