I have been diagnosed with an overactive thyroid and just starting having pain in my rib cage. I don't know if the pain is cause by my thyroid but knowing that someone else is experiencing the same symptoms leads to think that is very possible.
Your thyroid is in your neck it has 2 haves that live on either side of your vocal cords they produce hormones that mainly deal with how your body metabolizes your food is extreme weight lose or weight gain is a common sine along with dull hair, and being lethargic