# Thyroiditis

URL: https://thethyroidologist.com/conditions/thyroiditis/
Section: Conditions
Last medically reviewed: 2025-11-01

> Thyroiditis — thyroid gland inflammation. Subacute, painless/postpartum, and drug-induced types; the hyper-then-hypo pattern and how it is diagnosed.

Thyroiditis is inflammation of the thyroid gland. Several distinct types exist, and many follow a characteristic pattern: a temporary overactive phase (as stored hormone leaks out) followed by a temporary underactive phase, before the gland usually recovers.
Identifying the type matters because management differs — some resolve spontaneously while others need treatment.

## Main types

Subacute (de Quervain’s) thyroiditis typically follows a viral illness and causes a painful, tender thyroid. Painless (silent) thyroiditis and postpartum thyroiditis occur without pain; postpartum thyroiditis develops within the first year after delivery.
Hashimoto’s thyroiditis is the chronic autoimmune form covered separately. Drug-induced thyroiditis can follow amiodarone or interferon. Rarer forms include infectious and radiation thyroiditis.

## The typical course

Destructive thyroiditis releases pre-formed hormone, causing a thyrotoxic phase lasting weeks to months. The gland then often enters a hypothyroid phase before recovering — though a minority of patients remain permanently hypothyroid, particularly after postpartum thyroiditis.
Radioactive iodine uptake is typically very low during the thyrotoxic phase — a key feature distinguishing it from Graves’ disease.

## Diagnosis and management

Diagnosis relies on thyroid function tests showing fluctuating TSH/T4, low iodine uptake (or low vascularity on ultrasound), and sometimes raised inflammatory markers or antibodies. Painful thyroiditis may need anti-inflammatory treatment.
The thyrotoxic phase is usually managed symptomatically with beta-blockers — antithyroid drugs do not help because the hormone is leaking, not being overproduced. Hypothyroidism, if it occurs, is treated with levothyroxine, often temporarily.

## Frequently asked questions

### Is thyroiditis contagious?

No. Although some forms follow viral infections, the thyroid inflammation itself is not contagious.

### Will my thyroid recover after thyroiditis?

Many forms resolve completely. Postpartum thyroiditis leaves about 20% of women permanently hypothyroid, so follow-up testing for at least 12 months is recommended.

### Why did my doctor not prescribe antithyroid medication?

In destructive thyroiditis the gland is leaking stored hormone rather than producing excess. Antithyroid drugs block production and therefore do not help; symptom control and monitoring are the correct approach.

## Disclaimer

The content on this website is for general educational purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional about your specific condition.

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