Rheumatoid Arthritis Support Group
Rheumatoid arthritis is a chronic, inflammatory, multisystem, autoimmune disorder. It is a disabling and painful condition which can lead to substantial loss of mobility due to pain and joint destruction. The disease is also systemic in that it often also affects many extra-articular tissues throughout the body including the skin, blood vessels, heart, lungs, and...
Anyway, as you may know, most thyroid disease, both hypo and hyper, is autoimmune. As you also may know, autoimmune diseases tend to run in packs, kind of like coyotes, feral dogs, or teenagers. There have been posts on here about thyroid problems before, and LOTS of people are members of the club.
4.3 isn't sky-high for TSH, but as Sally points out, many feel that the current range is too high. The biggest question: how do you feel? Energy OK? any unexplained weight gain (the Christmas cookies don't count!)? cold all the time? Joint pain is on the list, but for anyone posting here, that's a moving target even with a perfect thyroid.
Your thyroid meds may need a bit of tweaking. Have you changed pharmacies, or has your pharmacy changed the supplier of their generics? Thyroid replacement hormone is one of a very few drugs where different brands affect people differently. It's also a tricky drug to regulate. The dose a person needs seems to be quite individual, and not related to size, weight, all the usual stuff.
You might ask about getting your Free T3 and Free T4 checked. They measure how much hormone is circulating and available for use, where the TSH just measures the pituitary hormone that tells your thyroid how hard to work. Your dose may need to be upped a bit, but this is a bump and not a crisis.