How does stress make us ill? Study sheds light
11 Jan 2018 at 5:00pm
Have you ever put your illness down to stress? In a new study, researchers help to explain precisely how psychological stress makes us sick.

What you should know about hair dye allergies
5 Jan 2018 at 11:00am
A look at hair dye allergy reactions when someone reacts to the dye they have put on their hair. Included is detail on natural alternatives.

What to know about allergy shots
24 Dec 2017 at 3:00pm
A look at allergy shots, a way of preventing allergies through injections. Included is detail on how they work and the typical costs involved.

What are the symptoms of organophosphate poisoning?
19 Dec 2017 at 8:00am
In this article, we examine the symptoms of poisoning from organophosphate, a form of insecticide. We also look at the risks and treatment options.

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Allergies

An allergy or Type I hypersensitivity is an immune malfunction whereby a person's body is hypersensitised to react immunologically to typically nonimmunogenic substances. When a person is hypersensitised, these substances are known as allergens. The word allergy derives from the Greek words allos meaning "other" and ergon meaning "reaction" or "reactivity". Type I hypersensitivity is characterised by excessive activation of mast cells by immunoglobulin E resulting in a systemic inflammatory response that can result in symptoms as benign as a runny nose, to life-threatening anaphylactic shock and death.

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