Can Allergy Make Me Lose My Hair?

I’m an 18 year old female with such thinning hair there is not much left, i’ve been to two different dermatologists and many a few doctors i’ve had every blood test done to come up with a solution, multiple times and yet the most common response is, everything is normal but we can prescribe you a medicine that may help. there is definitely something wrong but nobody can tell me what it is. i take vitamins, healthy diet, drug free. possible solution or diagnosis? i’ve heard possible allergy could do it but what could i be allergic to? ever heard of this?

I do not believe that general allergies can cause hair loss. Allergy to topical dyes and such may cause hair loss, however. Without seeing you and examining you though, I can not do anything. You have already seen two doctors and you must press them for an answer.