“Your thyroid labs look normal.” For many people with Hashimoto’s, those words arrive at the same time as exhaustion, brain fog, weight gain, cold hands, and thinning hair. One reason is that thyroid care is often guided by a single number, TSH, when the full picture is more complicated.
Key Takeaways
- Hashimoto’s thyroiditis is an autoimmune condition and the most common cause of hypothyroidism in the United States. It is far more common in women.
- TSH is a useful screening test, but a full panel (free T4, free T3, and thyroid antibodies) tells you much more.
- Levothyroxine works well for most people, but some continue to have symptoms. Major thyroid societies now acknowledge that a trial of combination T4/T3 therapy can be reasonable in selected patients.
- Nutrient levels such as iron, vitamin D, and B12, along with sex hormones and sleep, can all affect how you feel.
- Never adjust thyroid medication on your own. Changes should be made with a provider and followed by repeat labs.
What Each Thyroid Test Tells You
- TSH: the pituitary’s signal to the thyroid. A high TSH usually means the thyroid is underperforming.
- Free T4: the main hormone the thyroid produces, available to your tissues.
- Free T3: the active form of thyroid hormone, mostly converted from T4 in the body.
- Reverse T3: an inactive form. Its usefulness is debated, but some clinicians consider it alongside other results.
- TPO and thyroglobulin antibodies: markers of the autoimmune process behind Hashimoto’s. They can be elevated years before TSH changes.
Why Some People Still Feel Hypothyroid on Treatment
Studies consistently find that a meaningful minority of people on levothyroxine continue to report symptoms despite normal TSH. Possible reasons include:
- A dose that is technically “in range” but not right for you
- Reduced conversion of T4 to active T3 in some people
- Absorption issues, for example taking medication with coffee, calcium, or iron
- Overlapping causes such as low ferritin, vitamin D or B12 deficiency, perimenopause, sleep apnea, or depression
Treatment Options
Levothyroxine (T4) remains the standard first-line treatment. For patients who still feel unwell after optimization and other causes have been ruled out, a 2021 joint statement from American, British, and European thyroid associations recognized that a trial of combination T4/T3 therapy may be considered, with careful monitoring. Desiccated thyroid is another option some patients ask about, and it should be discussed with your provider.
Supporting the Autoimmune Side
There’s no proven way to reverse Hashimoto’s, but some steps can support overall health. Correcting deficiencies matters. Some studies suggest selenium may lower antibody levels, though its effect on symptoms is less clear. Celiac disease is more common in people with Hashimoto’s, so screening may be worthwhile, while strict gluten-free diets haven’t been proven to help people without celiac.
Ready to talk it through? Book a consultation at Victory Rejuvenate in Austin, TX, and we’ll review your history and goals and tell you honestly whether a deeper thyroid evaluation is a good fit.
Clinical Note: This content is for educational purposes only and does not constitute medical advice. Hormone and peptide therapies should always be managed by a qualified healthcare provider following a comprehensive evaluation.