Allergy is a hypersensitivity reaction, an immunological response to an otherwise harmless agent like tree and grass pollens, House Dust mites, Insects, fungi, and foods resulting in undesirable clinical manifestations. These clinical manifestations can range from runny nose, sneezing, nasal blockage, itching of eyes, and breathlessness to hives on the skin, and swelling on extremities, genitals, or eyes. Allergies can be of many types. It manifests itself in various forms of Allergic Rhino Conjunctivitis, Asthma, Food allergy, Urticaria, Angioedema, Insect allergy, Drug allergy, and Atopic dermatitis. Some of the patients might outgrow their allergy while some can have a chronic course.