An Allergy is an immune system response to a substance that is not typically harmful to our body. These substances are called allergens . The immune system overreacts to these allergens and produces a chemical, histamine that causes allergy symptoms, mild to a life-threatening reaction (known as anaphylaxis ). Approx 20% population will suffer from allergy at sometime in their life. Symptom: The symptoms of an allergic reaction can vary from mild to severe. • Skin rashes • Itching • Nasal congestion • Sore throat • Watery or itchy eyes • Abdominal cramping or pain • Difficulty in swallowing • Nausea or vomiting • Diarrhea • Difficulty in breathing • Wheezing or cough • Dizziness • Anxiety • Flushing or swelling of the face or eye • Weakness • Unconsciousness Sometime severe and sudden allergic reaction can develop within seconds after exposure to an allergen. This type of reaction is known as anaphylactic reaction and