Allergies, also known as allergic diseases, have many conditions due to the hyperactivity of the immune system, which are usually harmless substances in the environment. These diseases include grass fever, food allergies, ectopic dermatitis, allergic asthma and anaphylaxis. Symptoms may include red eyes, an itchy rash, sneezing, a runny nose, shortness of breath or swelling. Food intolerance and food poisoning are different conditions. Common allergens include pollen and some foods. Metal and other substances can also cause problems. Food, insect stings and medicines are the common causes of severe reactions.Their development is due to both genetic and environmental factors.

In the underlying mechanisms immunoglobulin E antibody (IGE) is part of the body's immune system, is connected to an allergen and then is included in a receptor on mast cells or basophil where it triggers the release of inflammatory chemicals such as histamine. . Diagnosis is usually based on the medical history of a person. Further testing of the skin or blood may be useful in some cases. Positive testing, however, does not mean that there is an important allergy to the substance in the question. Early risks of potential allergies can be protective. Treatment of allergy involves avoiding known allergies and the use of drugs such as steroids and antihistamines. In severe reactions, injection adrenaline (epinephrine) is recommended. . Allergen immunotherapy, which gradually exposes people to large and large amounts of alarms, is useful for some types of allergies such as o fever and reaction to insect bites. Its use in food allergy is unclear. Allergy is common practice. In the developed world, about 20% of people are affected by allergic rhinitis, approximately 6% of people have at least one food allergy, and approximately 20% of people have inflammation of atopic dermis at some point of time. Depending on the country, approximately 1 to 18% of people have asthma. Anaphylaxis occurs between 0.05-2% of people. The rate of many allergic diseases appears to be increasing. The term "allergy" was first used by Clemens von Pirckt in 1906.

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