I am dealing with this now. Have known I have hypothyroidism for years & have been on meds. Was told my thyroid was non functioning. Could have it totally removed..then read the possible complications. Decided to just let it sit there. Twice a year Dr. checks levels. A few years ago he started adjusting meds. If it's not functioning why r u changing meds, I asked. He said it has to do with how all 3 r working together. Recently I under went tests for arm & thumb, finger pain. Dr. said carpal tunnel...wear brace, can't do anything else cuz it will probably dissipate when we get your thyroid levels corrected. Never heard that before. He also said good numbers for one person may leave another symptomatic. It's a range. The number needed to be symptom free can change with age or presence of other meds or other medical problems. Just getting a number within the normal range is not enough. Apparently there's no direct correlation so I'm going to have to take an increased amount, wait a month, retest, evaluate symptoms on & on until we find the right dose. In the normal scheme of things not a biggie, fixable. But a pain both literally & figuratively!