An allergy is the response of the body’s immune system to normally harmless substances, such as pollens, foods, and house dust mite. Click here to sign up to receive specific allergy news and updates on your conditions. When a person comes into contact with a particular allergen they are allergic to, a reaction occurs. This begins when the allergen for example, pollen enters the body, triggering an antibody response. When the allergen comes into contact with the antibodies, these cells respond by releasing certain substances, one of which is called histamine.
On this page you will find information about the different types of food allergy, including peanut allergy, egg allergy and milk allergy. We have Factsheets available on many types of food allergy, with overview snippets on this page. You can find all of our downloadable Factsheets at the bottom. Click here to sign up to receive specific food allergy news and updates. Download our free Food and Symptoms Diary to track which foods are causing adverse reactions.
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Nuts and peanuts can cause allergic reactions, which are sometimes severe. A severe reaction to nuts is called anaphylaxis and can be life-threatening. Symptoms often start quickly, within an hour of coming into contact with a nut, and sometimes within minutes. If you have a nut allergy, avoiding foods that contain nuts will prevent an allergic reaction. But, if you do come into contact with nuts, and a reaction starts then treating it quickly is important. If you have a severe allergic reaction, if available, give yourself an adrenaline epinephrine injection straightaway and call an ambulance. If you are well prepared and take action quickly the risk of suffering any serious problems is small. An allergy occurs when your body’s immune system, which normally fights infection, overreacts to a substance called an allergen.