Symptoms of allergy can range from respiratory symptoms typically with dusts and with molds and pollens. Itchy nose, sneezing, itchy eyes triggering off asthma attacks. And then with food typically they are tingling in the mouth, swelling of the mouth rashes around the mouth, vomiting, sometimes diarrhea.

The other type of allergy is skin allergy. Some people are allergic to things like nickel and other chemicals and they'll develop rashes on the skin following exposure.

Allergy is an abnormal response to some sort of environmental agent that we come in contact with. But when we have allergy, what's happening is that our bodies have been switched to treat the foreign protein as a potentially hostile chemical or a potential attacker and because of that, the body responds in the way that we recognize as an allergic reaction.

The thing about allergy is that it's a repetitive type of symptom. So, For example, everybody gets a cold and everybody sneezes from time to time but not everybody gets sneezing and a runny nose from April to August every year. Not everybody gets sneezy if they change the beds. It's something that's a bit out of the ordinary but it's something that's repetitive and its produced by a predictable outside influence.