Allergies are common diseases that occur when the immune system overreacts to something that is usually harmless, such as pollen in the case of hayfever, certain foods and drugs. Find answers to some of the most pertinent questions on allergies, including what causes them and how they differ from intolerances, as well as indulging in the latest cutting-edge research findings.
Discover more about allergies
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Top 5 mistakes when using air purifiers during hay fever seasonReferences If you're a hay fever sufferer, an air purifier may become your best friend this spring — but only if you use it right
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Best air purifiers for allergies 2026: Breathe easy this SpringBUYING GUIDE These are the best air purifiers for allergies you can buy in every category, from Levoit Core 600S and Molekule Air Pro to RabbitAir A3.
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New Jersey man dies from meat allergy triggered by tick biteA man in New Jersey has died from a meat allergy that people can develop after being bitten by certain tick species.
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Do air purifiers help with allergies?REFERENCE Air purifiers can improve air quality, but do these devices help relieve allergies?
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Is playing in the dirt good for kids' immune systems?Experts explain why it's healthy to let your children occasionally play in the dirt — and it may not be for the reasons you assume.
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Do air purifiers help with dust?REFERENCE Can air purifiers help with dust and dust mite allergies?
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Could allergies be 'deleted' someday?Two studies pinpoint long-lived immune cells that "remember" allergies and likely sustain them through time.
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Can you really be allergic to the sun?A number of medical conditions can cause an allergic reaction to ultraviolet light from the sun.
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What causes metal allergies?The symptoms of a metal allergy can vary in severity, but why do they happen?
