Yesterday my hay fever started to appear for the first time this year. It's later than normal, which is odd as we've had the 3rd warmest spring on record. Last year was dreadful despite poor weather! Now I've had hay fever for longer than I've had back pain, but I can see how it could be TMS. The fact that it often appears without warning and disappears equally as quickly, in a lot of people, suggests that it may be a psychological issue. But it's harder to be sure than it is with back pain. My question: how can I be sure that it is TMS?