YOU SAID:

if you think too much with out a brain your head might hurt

INTO JAPANESE

脳がないと考えすぎると頭が痛くなるかもしれません

BACK INTO ENGLISH

Thinking too much without a brain can hurt your head

INTO JAPANESE

脳なしで考えすぎると頭を痛める可能性があります

BACK INTO ENGLISH

Thinking too much without a brain can hurt your head