Allergies occur when immune system reacts to a foreign substance such as pollen, bee venom or pet dander that doesn't cause a reaction in most people. Immune system produces substances known as antibodies. Some antibodies protects from unwanted invaders that could make you sick or cause infection. When we have allergies, immune system makes antibodies that identify a particular allergen as harmful, even though it isn't.
Hay fever, also called allergic rhinitis, may cause Sneezing, Itching of the nose, eyes or roof of the mouth runny, stuffy nose, Watery, red or swollen eyes. A food allergy may cause tingling mouth, swelling of the lips, tongue, face or throat, hives, anaphylaxis. A drug allergy may cause hives, itchy skin, rash, facial swelling, wheezing. There will be increased risk of allergies if you have family members with asthma or allergies such as hay fever, hives or eczema. Children are more likely to develop an allergy than are adults.
Allergy treatments include Allergen avoidance, medications to reduce symptoms, Immunotherapy. Depending on the allergy, allergy medications can help in reducing immune system reaction and ease symptoms. Medications can include over-the-counter or prescription medications in the form of oral medications, nasal sprays or eyedrops. Immunotherapy involves a series of injections of purified allergen extracts, usually given over a period of a few years.