Does having a tree nut allergy increase your risk for other food allergies?

Many people with an allergy to one tree nut have allergies to other tree nuts or foods, which can further complicate dietary choices. For example, people who are allergic to cashews are often also allergic to pistachios because they are both part of the Anarcadiaceae family and can have the same or similar IgE binding proteins.^[1] This latter case is called cross-reactivity, and it can also occur with walnuts and pecans and with almonds and hazelnuts. Peanuts and eggs are other potential allergens among people with tree nut allergies.^[2]