Chestnuts are technically not considered tree nuts in the same way as almonds, walnuts, pecans, etc.

Here's why:

* Botanical Classification: Chestnuts belong to the *Fagaceae* family, which also includes oaks and beeches. They are classified as mast nuts, meaning they are the fruit of a tree. True nuts are usually classified in the *Juglandaceae* family.

* Allergy Considerations: People with nut allergies are not generally allergic to chestnuts. However, some people can be allergic to chestnuts, so it's always important to be cautious.

So, while chestnuts are the fruit of a tree and are sometimes referred to as "tree nuts," they're actually in a different botanical category.