You probably know that your thyroid helps to control the metabolism of your entire body but did you know that it also has many more functions than just that?
It's common for patients who are hypothyroid to gain weight, but one of the other (many symptoms) of hypothyroidism includes chronic musculoskeletal pain.
In fact it's not uncommon for hypothyroid patients to present with back pain, joint pain or multiple tender points deep in their muscular tissue.
While hypothyroidism can cause chronic pain and a fibromyalgia like syndrome this doesn't mean that ALL cases of fibromyalgia and chronic pain are due to hypothyroidism.
That being said...
If you have either condition (chronic pain syndrome, fibromyalgia or chronic fatigue syndrome) you absolutely should have your thyroid checked out.
And I don't mean a cursory glance at your TSH, I mean a complete thyroid panel and thorough work up that includes ALL thyroid lab tests including markers for autoimmune thyroiditis.
I hear patients all the time respond that their thyroid is "fine" only to find out upon closer look it's anything but fine.
Before we talk about how to correctly diagnose thyroid issues we need to talk about how thyroid hormone can cause chronic pain and fibromyalgia.
Bottom line: Hypothyroidism can certainly cause and potentiate chronic pain and fibromyalgia. Standard blood tests and standard "interpretation" of thyroid lab studies is insufficient to correctly diagnose the problem. To properly evaluate for this condition you need a complete set of lab tests and proper work up.
Tissue Level Hypothyroidism Explained
So what can cause "normal" thyroid lab tests but all the symptoms of hypothyroidism?
More : https://www.restartmed.com/hypothyroidism-chronic-pain/