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  2. 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.

  3. 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.

  4. Allergic rhinitis - Wikipedia

    en.wikipedia.org/wiki/Allergic_rhinitis

    Allergic rhinitis, of which the seasonal type is called hay fever, is a type of inflammation in the nose that occurs when the immune system overreacts to allergens in the air. [6] Signs and symptoms include a runny or stuffy nose, sneezing, red, itchy, and watery eyes, and swelling around the eyes. [1] The fluid from the nose is usually clear. [2]

  5. Allergen - Wikipedia

    en.wikipedia.org/wiki/Allergen

    Allergen. An allergen is a type of antigen that produces an abnormally vigorous immune response in which the immune system fights off a perceived threat that would otherwise be harmless to the body. Such reactions are called allergies . In technical terms, an allergen is an antigen that is capable of stimulating a type-I hypersensitivity ...

  6. Why You Suddenly Have Allergies - AOL

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

    Allergy symptoms happen when the immune system interprets typically harmless substances, such as grass or pollen, as threats. People without allergies don’t have immune responses to these ...

  7. Drug intolerance - Wikipedia

    en.wikipedia.org/wiki/Drug_intolerance

    Drug intolerance. Drug intolerance or drug sensitivity refers to an inability to tolerate the adverse effects of a medication, generally at therapeutic or subtherapeutic doses. Conversely, a patient is said to be "tolerating" a drug when they can tolerate its adverse effects.

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

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

    24 Hour Allergy Relief Tablets. Some people prefer Zyrtec over Allegra, but the medications work similarly to block histamine and minimize symptoms, like sneezing, runny nose, itchy eyes and hives ...

  9. Food intolerance - Wikipedia

    en.wikipedia.org/wiki/Food_intolerance

    Signs and symptoms. Food intolerance is more chronic, less acute, less obvious in its presentation, and often more difficult to diagnose than a food allergy. Symptoms of food intolerance vary greatly, and can be mistaken for the symptoms of a food allergy.

  10. Food allergy - Wikipedia

    en.wikipedia.org/wiki/Food_allergy

    A food allergy is an abnormal immune response to food. The symptoms of the allergic reaction may range from mild to severe. They may include itchiness, swelling of the tongue, vomiting, diarrhea, hives, trouble breathing, or low blood pressure. This typically occurs within minutes to several hours of exposure.

  11. Multiple chemical sensitivity - Wikipedia

    en.wikipedia.org/wiki/Multiple_chemical_sensitivity

    Multiple chemical sensitivity ( MCS ), also known as idiopathic environmental intolerances ( IEI ), is an unrecognized and controversial diagnosis characterized by chronic symptoms attributed to exposure to low levels of commonly used chemicals. [1] [2] Symptoms are typically vague and non-specific. They may include fatigue, headaches, nausea ...