Loads of people have allergies, some are just an annoyance others are worse. In the worst case, it can be life threatening. An allergy is an immune system response to otherwise harmless substances such as pollen, some foods or dust. Even though these aren't harmful substances, the body identifies them as a threat and responds to them. The immune system "fights" the allergen, upon the following exposure the same response is triggered.
There are many ways of managing allergies, some as simple as avoiding the allergy or medical treatments like immunotherapy. The most common of which, is to take a form of anti histamine, this lowers the level of histamine in the blood, decreasing any symptoms you might be suffering from.
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