Overview of Allergic Diseases

Conditions where the immune system reacts abnormally to a foreign substance.
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Types Of Allergies | Allergy Symptoms | Allergy Treatments | Allergic Reactions | Immunotherapy | Antihistamines | Allergens
Prepared by Lee Cheng, reviewed by Dr. Helena Rodriguez

Allergic Diseases FAQ


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What are allergic diseases?

Allergic diseases encompass a spectrum of disorders characterized by the development of an overactive immune response to an otherwise harmless allergen, resulting in a Th2 polarized cytokine response to the allergen and the production of an IgE antibody response. Allergic diseases are manifested in a number of different ways.

What is an allergic reaction?

An allergy is where your body reacts to something that's normally harmless like pollen, dust or animal fur. The symptoms can be mild, but for some people they can be very serious. Things that cause allergic reactions are called allergens.

What causes allergies?

Allergies occur when your immune system reacts to a foreign substance — such as pollen, bee venom or pet dander — or a food that doesn't cause a reaction in most people. Your immune system produces substances known as antibodies.

What is an allergy & why is it a problem?

An allergy is a reaction by your immune system to something that does not bother most other people. People who have allergies often are sensitive to more than one thing. Substances that often cause reactions are: Normally, your immune system fights germs. It is your body's defense system.

Who can have an allergy?

Anyone can have an allergy. About half of people with allergy are children. Some people are more prone to allergic problems due to a condition called atopy (see below). Food is a common trigger in children whilst, in older people, medicines are common culprits.

What are some common things people are allergic to?

Things that people are commonly allergic to include: Tree and grass pollens. House dust mite. Animals, especially domestic pets such as cats and dogs. Insect venom such as that contained in wasp and bee stings. Medicines - for example, the antibiotic penicillin. Foods, such as nuts and eggs. Chemicals such as latex.

Allergic Diseases References

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