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Updated: Apr 26, 2026

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Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
Published on: March 17, 2023
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Cognitive function in Hashimoto's thyroiditis under levothyroxine treatment.
Vaitsa Giannouli1, Konstantinos A Toulis2, Nikolaos Syrmos3
1Medical School, Aristotle University of Thessaloniki, Thessaloniki, Greece.
Summary
This case study found no cognitive or emotional changes in two women with Hashimoto's thyroiditis (HT) on levothyroxine (LT4) treatment. Cognitive function remained stable, suggesting HT under LT4 treatment is benign.
Area of Science:
- Endocrinology
- Neuropsychology
- Thyroidology
Background:
- Overt hypothyroidism negatively impacts cognition and behavior.
- The cognitive effects of subclinical hypothyroidism or euthyroid Hashimoto's thyroiditis (HT) patients on levothyroxine (LT4) treatment remain controversial.
Observation:
- Two euthyroid, first-degree relatives with HT on LT4 treatment for two years were studied.
- Thyroid function tests and a comprehensive neuropsychological battery were administered at baseline and one year.
Findings:
- Patients exhibited exceptional performance on most cognitive functions.
- No significant changes in cognitive or mood parameters were detected over the one-year study period.
Implications:
- This case study suggests that HT in euthyroid patients on LT4 treatment does not lead to noticeable cognitive decline.
- Findings support the benign nature of HT regarding cognitive and emotional well-being when managed with LT4.
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