What causes allergic reactions?!


Question: What causes allergic reactions!?
Answers:
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, or allergic, reaction!.

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