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Allergic reactions do not happen the first time you come into contact with an allergen, but at a later point of contact. This is because the body’s immune system has to develop sensitivity to the allergen (see box) before you can become allergic to it.An allergic reaction is the body's way of responding to an "invader." When the body senses a foreign substance, called an antigen, the immune system is triggered. The immune system normally protects the body from harmful agents such as bacteria and toxins. Its overreaction to a harmless substance (an allergen) is called a hypersensitivity reaction, or an allergic reaction.Allergy symptoms depend on your particular allergy, and can involve the airways, sinuses and nasal passages, skin, and digestive system.
 

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Interesting. Is there any reason why you posted this? Are you experiencing an allergy? I believe I have one, I suffer with chronic catarrh. It's a real pain and is the cause of ear infections and sore throats. I suspect it's either something in my diet, maybe lactose intolerance from dairy foods, wheat or perhaps even dust. I frequently have a runny nose though and seem very sensitive to temperature changes.
 
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