Evidence-based

Feeling exhausted despite “normal” thyroid labs?

Your symptoms are real. But they might not be coming from your thyroid. Explore evidence-based alternatives.

Start symptom check Compare conditions
22% of men and 17% of women have sleep apnea on testing (AHI ≥ 5) ↗︎
82–93% of moderate-to-severe sleep apnea was undiagnosed (US, 1997) ↗︎
47.9% of people worldwide have vitamin D below 50 nmol/L (20 ng/mL) ↗︎
5–10% of treated patients have persistent symptoms despite a normal TSH ↗︎
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Compare conditions

An illustrative comparison of how different conditions can affect quality of life

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Symptom checker

Select your symptoms to see which conditions share them

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Important

This tool is for educational purposes only. It cannot diagnose medical conditions. Always consult a healthcare provider for proper evaluation and testing.

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Explore conditions

Conditions that share symptoms with hypothyroidism

Obstructive sleep apnea 11 symptoms · 22% of men, 17% of women (AHI ≥ 5) Major depressive disorder 10 symptoms · 5.2% of adults worldwide (WHO) Iron deficiency 9 symptoms · 9–11% of US women of childbearing age Perimenopause 13 symptoms · All women pass through it, typically in their mid-to-late 40s Vitamin D deficiency 7 symptoms · 47.9% worldwide below 50 nmol/L (20 ng/mL) Hypothyroidism 9 symptoms · 4.6% in the US (0.3% overt, 4.3% subclinical)
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Common thyroid myths

Claims from thyroid forums, set against the evidence

“My TSH is 'normal' but not 'optimal' - that's why I feel bad” See the evidence “I can't convert T4 to T3 properly” See the evidence “Reverse T3 is blocking my thyroid function” See the evidence “I need my TSH under 1.0 to feel good” See the evidence “Natural desiccated thyroid is better than synthetic” See the evidence
Go deeper

For clinicians and the curious

Autoimmune conditions linked to Hashimoto’s and Graves’ disease Relative risks, symptoms and screening tests Thyroid function test pitfalls: when it’s not the thyroid Illness, drugs, assay interference and central hypothyroidism

Medically reviewed · Last reviewed