Thyroid Diseases
Hashimoto Thyroiditis
Diagnosis, monitoring, levothyroxine management in autoimmune hypothyroidism, and common dietary misconceptions.
What is Hashimoto thyroiditis and is there a treatment?
Hashimoto thyroiditis is an autoimmune disease targeting the thyroid. The immune system perceives thyroid cells as foreign and attacks them with anti-TPO and anti-Tg antibodies; over time, gland fibrosis and hypothyroidism develop. Symptoms: fatigue, weight gain, constipation, cold intolerance, hair loss, brain fog, depressive mood. Diagnosis: high TSH, low fT4, positive anti-TPO/anti-Tg. Treatment: lifelong levothyroxine (T4) replacement — dose titrated to body weight, age, and cardiac health. There is no "cure", but with correct replacement, patients live entirely normal lives. Evidence for iodine restriction and gluten-free diet is limited; not recommended without a specific medical reason.
Lifestyle and diet — what is the evidence?
Social media touts a "gluten-free, dairy-free, soy-free diet for Hashimoto." Clinical evidence is limited: without coeliac disease, gluten restriction does not meaningfully change antibody levels or symptoms. Individuals may try; if no clear benefit appears in 3–6 months of consistent use, continuation is not required.
Selenium supplementation (200 mcg/day) lowers anti-TPO antibodies in some studies; clinical benefit remains debated. Vitamin D deficiency is common — replacement is recommended. Excessive iodine (eggs, seafood, iodised salt) can worsen Hashimoto; not overconsuming is sufficient.
Frequently Asked Questions
- First check TSH — if optimal (preferably 0.5–2.5 mIU/L), investigate other causes: B12 deficiency, iron deficiency, vitamin D deficiency, depression, sleep apnea.
- Hashimoto slightly increases thyroid lymphoma risk (very rare). Papillary cancer can also be more frequent; ultrasound surveillance is standard.
- On an empty stomach in the morning, at least 30 minutes before breakfast, with water. Iron, calcium, zinc supplements and coffee reduce absorption; keep 4 hours apart.
- Yes. Untreated hypothyroidism increases miscarriage, preeclampsia, and developmental risk. Levothyroxine dose increases 20–30% in pregnancy; TSH checked at trimester start.
- Children with a family history have slightly elevated risk. Annual TSH + anti-TPO check from adolescence is advised.
References
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