Subacute Thyroiditis in Hashimoto's: Transient Hyperthyroidism
Patients with Hashimoto's thyroiditis can develop subacute (de Quervain's) thyroiditis, causing a temporary thyrotoxic phase (weeks to months) due to inflammatory release of stored hormone.
Typical Course
- Thyrotoxic phase: Low TSH, high T4/T3, neck pain, tachycardia, anxiety, weight loss.
- Hypothyroid phase: As stores deplete, TSH rises, T4 falls—may become overtly hypothyroid.
- Recovery: Often returns to baseline Hashimoto's status; some remain permanently hypothyroid.
Management
- Beta-blockers for adrenergic symptoms.
- NSAIDs or glucocorticoids for neck pain/inflammation.
- Monitor thyroid function every 4–6 weeks; adjust levothyroxine if needed.
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