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Thyroid disease in older adults
In older adults the normal TSH range rises with age, thyroid symptoms are vague, and mild subclinical hypothyroidism (TSH below 10) usually needs no treatment; by contrast, a suppressed TSH (below 0.1) raises the risk of atrial fibrillation and osteoporosis and is treated, and every hormone replacement follows "start low and go slow".
Why it matters in the exam
The exam presents an 80-year-old with fatigue and a TSH of 7 with a normal FT4, and asks what to do: repeat the test in 2–3 months and do not treat routinely — in the TRUST trial (2017) levothyroxine did not improve symptoms or fatigue in people aged 65 and over with subclinical hypothyroidism. Another question: an older adult with coronary disease and overt hypothyroidism — start levothyroxine at a low dose (25–50 mcg) and increase gradually every 4–6 weeks.
Recurring points: "apathetic" hyperthyroidism in an older adult presents with weight loss, atrial fibrillation and apathy; the common cause in older age is toxic multinodular goitre, and radioactive iodine is an accepted treatment; amiodarone causes hypothyroidism or hyperthyroidism (type 1 — iodine excess in a diseased gland, treated with methimazole; type 2 — destructive thyroiditis, treated with prednisone); in acute illness thyroid tests are not checked routinely, because "non-thyroidal illness syndrome" alters the values; and in myxoedema coma hydrocortisone is given before or together with intravenous levothyroxine.
Over-replacement with levothyroxine is also common in older adults and increases the risk of atrial fibrillation and fractures, so the TSH target in the very old may be slightly higher.
Key points
- The TSH range rises with age; repeat the test before deciding.
- Subclinical with TSH below 10 — usually no treatment (TRUST).
- Levothyroxine in older adults: 25–50 mcg, increase every 4–6 weeks.
- TSH below 0.1 — treat from age 65 (fibrillation, bone).
- Amiodarone — check TSH; type 1 methimazole, type 2 prednisone.
Summary table
| Situation | What is done | Exam point |
|---|---|---|
| Slightly high TSH, normal FT4 (subclinical) | Repeat test in 2–3 months; usually no treatment if TSH below 10 | TRUST: no benefit at age 65 and over |
| Overt hypothyroidism | Levothyroxine 25–50 mcg, increase every 4–6 weeks | In heart disease — start especially low |
| Suppressed TSH (below 0.1) | Treat from age 65 | Atrial fibrillation and osteoporosis |
| "Apathetic" hyperthyroidism | Weight loss, atrial fibrillation, apathy | Toxic multinodular goitre is common |
| Amiodarone | TSH before and during follow-up; type 1 — methimazole; type 2 — prednisone | Hypothyroidism is also possible |
| Myxoedema coma | Hydrocortisone, then intravenous levothyroxine, gradual rewarming, support | Hypothermia, hyponatraemia, hypoventilation |
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Sources
- TRUST trial — Thyroid hormone therapy for older adults with subclinical hypothyroidism (New England Journal of Medicine), 2017 — Main results
- American Thyroid Association guidelines for the diagnosis and management of hyperthyroidism and other causes of thyrotoxicosis, 2016 — Subclinical hyperthyroidism and amiodarone-induced thyrotoxicosis
- Hazzard's Geriatric Medicine and Gerontology, 8th edition (2022) — Thyroid disorders in older adults
Sources are given for further reading; the text is written afresh and not copied from them.
Reviewed by the Examqo AI Professor · 2026-11-06. The text may contain errors; when in doubt, check the source.