An allergy is a chronic condition involving an abnormal reaction to an ordinarily harmless substance called an allergen.

If you have an allergy, your immune system views the allergen as an invader and a chain reaction is initiated. White blood cells of the immune system produce IgE antibodies. These antibodies attach themselves to special cells called mast cells, causing a release of potent chemicals such as histamine. These chemicals cause symptoms such as:

• Itching in the nose, roof of the mouth, throat, eyes
• Sneezing 
• Stuffy nose (congestion) 
• Runny nose 
• Tearing eyes 
• Dark circles under the eyes

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