Health Encyclopedia

Subacute thyroiditis

Definition

Subacute thyroiditis involves swelling (inflammation) of the thyroid gland that usually follows an upper respiratory infection.

Alternative Names

De Quervain's thyroiditis; Subacute nonsuppurative thyroiditis; Giant cell thyroiditis; Subacute granulomatous thyroiditis

Causes, incidence, and risk factors

Subacute thyroiditis is a rare condition. It is thought to be caused by a viral infection. The condition often occurs after a viral infection of the upper respiratory tract, such as mumps and influenza.

Subacute thyroiditis occurs most often in middle-aged women with recent symptoms of a viral respiratory tract infection.

Symptoms

The most obvious symptom of subacute thyroiditis is pain in the neck. Sometimes the pain can spread (radiate) to the jaw or ears. Painful enlargement of the thyroid gland may last for weeks or months.

Other symptoms include:

Difficulty swallowing
Fatigue
Fever
Hoarseness
Tenderness when gentle pressure is applied to the thyroid gland (palpation)
Weakness

Symptoms of too much thyroid hormone (hyperthyroidism) may include:

Diarrhea
Heat intolerance
Nervousness
Palpitations
Sweating
Tremor
Weight loss

Later, symptoms of too little thyroid hormone (hypothyroidism) may occur, including:

Cold intolerance
Constipation
Fatigue

Usually thyroid gland function returns to normal. But in some cases hypothyroidism may be permanent.

Signs and tests

Laboratory tests early in the course of the disease may show:

Low serum thyroid stimulating hormone (TSH) level
High serum free T4 (thyroid hormone, thyroxine) level
Low radioactive iodine uptake
High serum thyroglobulin level
High erythrocyte sedimentation rate (ESR)

Laboratory tests later in the disease may show:

High serum TSH level
Low serum free T4

There may be low levels of antithyroid antibodies. Thyroid gland biopsy is usually not needed, but will show a type of inflammation characteristic of this condition. Lab tests should return to normal as the condition goes away.

Treatment

The purpose of treatment is to reduce pain and inflammation and treat hyperthyroidism, if it occurs. Anti-inflammatory medications such as aspirin or ibuprofen are used to control pain in mild cases.

More serious cases may need temporary treatment with steroids (for example, prednisone) to control inflammation. Symptoms of hyperthyroidism are treated with a class of medications called beta blockers (for example, propranolol, atenolol). Antithyroid drugs or thionamides are not effective in treating this condition.

Expectations (prognosis)

The condition should improve on its own. However, the illness may last for months. Long-term or severe complications do not usually occur.

Complications

Permanent hypothyroidism
Subacute thyroiditis returns after treatment

Calling your health care provider

Call your health care provider if:

You have symptoms of this disorder
You have thyroiditis and symptoms do not improve with treatment

Prevention

MMR (measles, mumps, rubella) immunization (vaccine) or flu vaccine may help prevent these conditions, which can cause subacute thyroiditis. Other causes may not be preventable.

References

Ladenson P, Kim M. Thyroid. In: Goldman L and Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders; 2007:chap 244.

Review Date:6/17/2008
Reviewed By:Elizabeth H. Holt, MD, PhD, Assistant Professor of Medicine, Section of Endocrinology and Metabolism, Yale University. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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