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Cause[edit]. Risk factors for allergy can be placed in two general categories, namely host and environmental factors. Host factors include ...

What Causes Chronic Allergies and Allergy Symptoms? - WebMD


Will your allergies stick around for the rest of your life, or might they get better or even stop? WebMD explains.

I Never Had Allergies Before. How Did I Get Them? | Pollen.com


Learn all about allergies and what causes allergy. Learn how allergens can cause sneezing, itchy watery eyes and a runny nose. Also find out about ...

Allergies Causes - Mayo Clinic


When you're exposed to the allergen again, these antibodies can release a number of immune system chemicals, such as histamine, that cause allergy ...

Allergy Symptoms | Common Allergy Causes | ACAAI


Allergy symptoms vary with different allergens (pollen, dust mites, molds, ... The release of histamine can cause a variety of symptoms, including a skin rash, ...

Why do We have Allergies? | Fight the Cause of Allergy


What Causes Allergies to Occur? The exact causes of allergy symptoms are still being investigated. However, it is known that these are due to immune system ...

Skin Allergy Symptoms, Diagnosis, Treatment & Management | AAAAI


Coming in contact with poison ivy, poison oak and poison sumac can also cause allergic contact dermatitis. The red, itchy rash is caused by an oily coating ...

Skin Allergies | Causes, Symptoms & Treatment | ACAAI


Rashes can be caused by many things, including plants (poison ivy, for example) , allergic reactions to a medication or a food, or an illness (measles or ...

Hay Fever & Seasonal Allergies: Symptoms, Causes & Treatment


Feb 18, 2015 ... Itchy eyes, a congested nose, sneezing, wheezing and hives: these are symptoms of an allergic reaction to the environment caused when ...

Allergic Reaction - Healthline


What Causes an Allergic Reaction? Advertisement. Causes Icon. Doctors don't know why some people experience allergies. Allergies ...

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Allergy (Allergies) Symptoms, Causes, Treatment - What is an ...


What is an allergy? ... these foreign substances are normally seen by the body as harmless in nonallergic individuals and do not cause a response in them.

Types of Allergies | AAFA.org


Allergies are diseases of the immune system that cause an overreaction to substances called "allergens."

Who Has Allergies | ACAAI


While allergies are most common in children, they can appear at any time and any age. Sometimes allergies disappear, only to return years later. Exposure to ...