Kissing bug bites: Symptoms, risks, and treatments
7 Dec 2019 at 7:00am
Sustaining a kissing bug bite may lead to Chagas disease or allergic reactions. In this article, learn about the symptoms, risks, and treatments associated with kissing bug bites.

Causes and treatment of a split lip
30 Nov 2019 at 7:00am
A split lip is a common minor injury with a range of possible causes, including cold weather, skin picking, and dehydration. Learn more here.

What causes pain under the left armpit?
28 Nov 2019 at 8:00pm
Causes of pain under the left armpit can range from minor skin infections to nerve damage. Learn about these and other causes, as well as when to see a doctor.

What to know about nut allergies
18 Nov 2019 at 7:00pm
Tree nut allergies are common, and they include reactions to almonds, cashews, and walnuts. An allergy to peanuts is not technically a nut allergy. Learn more about nut allergies here.

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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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