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  2. It's Not in Your Head: Doctors Say Allergy Season Is ... - AOL

    www.aol.com/not-head-doctors-allergy-season...

    An analysis of pollen count data from 1990 to 2018 found that recent spring allergy seasons are kicking off about 20 days earlier, and pollen concentrations have increased by about 20%, especially ...

  3. Why You Suddenly Have Allergies - AOL

    www.aol.com/lifestyle/allergies-change...

    Bacterial and viral infections can cause allergy-like symptoms, as can anatomical issues like a deviated septum. Some people are also sensitive to irritants like cigarette smoke and perfume, but ...

  4. Hypersensitivity - Wikipedia

    en.wikipedia.org/wiki/Hypersensitivity

    Hypersensitivity (also called hypersensitivity reaction or intolerance) is an abnormal physiological condition in which there is an undesirable and adverse immune response to antigen. It is an abnormality in the immune system that causes immune diseases including allergies and autoimmunity.

  5. Oral allergy syndrome - Wikipedia

    en.wikipedia.org/wiki/Oral_allergy_syndrome

    Oral allergy syndrome (OAS) or pollen-food allergy syndrome (PFAS) is a type of allergy classified by a cluster of allergic reactions in the mouth and throat in response to eating certain (usually fresh) fruits, nuts, and vegetables. It typically develops in adults with hay fever. It is not usually serious.

  6. List of allergens - Wikipedia

    en.wikipedia.org/wiki/List_of_allergens

    Wheat allergy symptoms should not be confused with celiac disease, gluten ataxia or non-celiac gluten sensitivity (NCGS). While wheat allergies are "true" allergies, celiac disease and gluten ataxia are an autoimmune diseases. NCGS is more similar to food intolerances but as of 2021 its pathogenesis is still not well understood.

  7. What is the difference between a food allergy, sensitivity ...

    www.aol.com/lifestyle/difference-between-food...

    Is it a food allergy, sensitivity or intolerance? Here's how to tell, according to experts. Skip to main content. Lifestyle. 24/7 Help. For premium support please call: 800-290-4726 more ways to ...

  8. Type I hypersensitivity - Wikipedia

    en.wikipedia.org/wiki/Type_I_hypersensitivity

    Immunology. Type I hypersensitivity (or immediate hypersensitivity ), in the Gell and Coombs classification of allergic reactions, is an allergic reaction provoked by re-exposure to a specific type of antigen referred to as an allergen. [1] Type I is distinct from type II, type III and type IV hypersensitivities.

  9. Is It Pink Eye or Allergies? Here’s Exactly How to ... - AOL

    www.aol.com/lifestyle/pink-eye-allergies-exactly...

    Red, itchy, or watery eyes are common symptoms of seasonal allergies, but they're also signs of pink eye, or conjunctivitis. Here’s how to tell the difference.

  10. Allergy - Wikipedia

    en.wikipedia.org/wiki/Allergy

    Allergies, also known as allergic diseases, are various conditions caused by hypersensitivity of the immune system to typically harmless substances in the environment. These diseases include hay fever, food allergies, atopic dermatitis, allergic asthma, and anaphylaxis.

  11. Sucrose intolerance - Wikipedia

    en.wikipedia.org/wiki/Sucrose_intolerance

    CSID symptoms are frequent, daily events; they are lifelong, and they are postprandial (occurring after eating food). These symptoms can range from mild to severe and include chronic, watery, acidic diarrhea; intestinal gas and bloating; nausea; and abdominal pain.