Sometimes, people are diagnosed as having what the doctor may call idiopathic anaphylaxis. This special type of anaphylaxis means that the cause for the anaphylactic reaction is unknown. During idiopathic anaphylaxis, the reaction is normally exactly the same and the signs and symptoms are typical. If the doctor diagnoses this, they will advise you to stay away from all of the most common allergens like shellfish, peanuts and eggs. This is because it could be that there may be more than one thing you are allergic to. Sometimes, the doctor will diagnose the condition as idiopathic, but then later on you may realise that you only get anaphylactic reactions after eating certain foods or after being stung by something. The doctor may also ask you to undertake allergy testing and physical examinations. In cases of idiopathic anaphylaxis, it is essential that you always carry around your prescribed auto-injector, as you cannot always stay away from allergens. Many people with idiopathic anaphylaxis see a decrease in reactions as their life goes on, again however, it is unclear why this is.