Tree nuts grow on trees, whereas peanuts grow underground and are considered legumes. Tree nuts include almonds, Brazil nuts, cashews, hazelnuts, pecans, pistachios and walnuts.

Is hazelnut a nut allergy?

Also known as filberts, cobnuts, and hazels, hazelnuts are edible nuts from roughly 15 species of shrubs and trees belonging to the birch family. Hazelnuts are often found in pastries and chocolates as well as in nut butters such as Nutella. Despite their uses, hazelnuts are the most common tree nut allergy in Europe.

Why am I allergic to tree nuts not hazelnuts?

People can be allergic to one type of tree nut, to some tree nuts, or to many tree nuts but not to other types of tree nuts. That's because some tree nuts contain similar proteins—for example, almonds and hazelnuts contain similar proteins, as do walnuts and pecans, and pistachios and cashews.