What happens if i eat almonds if i have a tree nut allergy?

No, you shouldn't: It largely depends on what type of tree nut allergy you have, and if you are allergic to several tree nuts. It's important to know that there is a 33% chance of cross reactivity among tree nuts. There is also a possibility of cross contamination, since many manufacturers process other nuts in the same proximity. Safest options is to avoid all tree nuts.