How Allergies Develop and Why They Exist

In a breathless episode of Life Noggin, narrator Pat Graziosi explains what allergies are, what happens inside the human body during an allergy attack and possible explanations as to why allergies exist.

Allergies are a serious problem for millions of people but how and why do they develop and what’s so different between allergies to pollen or dust and allergies to bee stings or soy.