What is an allergy?
Allergic reactions happen when a person is exposed to a normally harmless substance but their immune system overreacts causing the cells of the body to release chemicals. Hives may appear, lips may swell, there could be sniffles and stinging eyes; vomiting and diarrhoea, all dependent on the type of chemical released.
For an unfortunate few, allergies can trigger a potentially fatal whole-body reaction known as anaphylactic shock. When this happens, the treatment options are limited and not always successful.