Subacute Thyroiditis: Symptoms, Causes And How to Treat

Written by Medicover Team and Medically Reviewed by Dr Prashant Manohar Gaikwad , Endocrinologists

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1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

Subacute thyroiditis, also known as De Quervain's thyroiditis or granulomatous thyroiditis, is a temporary condition characterized by inflammation of the thyroid gland, leading to the release of excessive thyroid hormones into the bloodstream. This causes symptoms of hyperthyroidism, followed by a hypothyroid phase as the gland depletes its hormone reserves.

What Causes Subacute Thyroiditis?

Subacute thyroiditis is mainly caused by a viral infection or post-viral inflammation, leading to temporary thyroid gland damage and symptoms.

Viral infections: Most common cause; often follows infections like influenza, mumps, or COVID-19.
Post-viral immune response: The body's immune system overreacts after a viral illness, leading to thyroid inflammation.
Inflammatory reaction: Inflammation damages thyroid cells, causing hormone leakage into the bloodstream.
Genetic susceptibility: Some people may be more prone due to genetic factors.
Seasonal infections: More common during seasons when viral infections are widespread.
Unknown exact cause: In some cases, no clear trigger is identified.

Difference Between Subacute Thyroiditis and Hashimoto's Thyroiditis

It is essential to differentiate subacute thyroiditis from Hashimoto's thyroiditis, as the treatment and prognosis differ significantly.

Hashimoto's thyroiditis is an autoimmune condition leading to chronic hypothyroidism, whereas subacute thyroiditis is a temporary inflammatory condition.

Hashimoto's thyroiditis involves gradual thyroid gland destruction, while subacute thyroiditis involves a transient inflammatory process.

What Are the Symptoms of Subacute Thyroiditis?

Pain and Tenderness

One of the hallmark symptoms of subacute thyroiditis is a painful and tender thyroid gland. Patients often describe the pain as severe and radiating to the jaw or ears. This pain distinguishes subacute thyroiditis from other thyroid disorders.

Hyperthyroid Phase

During the initial phase, patients may experience symptoms of hyperthyroidism, including:

Rapid heartbeat (tachycardia)
Unexplained weight loss
Increased appetite
Nervousness and irritability
Tremors

Hypothyroid Phase

As the thyroid gland becomes depleted of hormones, patients may enter a hypothyroid phase, characterized by:

Fatigue
Weight gain
Cold intolerance
Dry skin
Constipation

Systemic Symptoms

Systemic symptoms such as fever, malaise, and muscle aches are also common, reflecting the underlying inflammatory process.

When Should You See a Doctor for Subacute Thyroiditis?

Consult a endocrinologist if you experience persistent or severe symptoms.

Severe neck pain or swelling
Symptoms of hyperthyroidism or hypothyroidism
Fever with thyroid discomfort
Symptoms lasting longer than expected

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How Is Subacute Thyroiditis Diagnosed?

Diagnosis of subacute thyroiditis involves a combination of clinical evaluation, laboratory tests, and imaging studies.

Clinical Evaluation

A thorough clinical evaluation includes a detailed patient history and physical examination. The presence of neck pain, tenderness, and systemic symptoms can suggest subacute thyroiditis.

Laboratory Tests

Laboratory tests are crucial for confirming the diagnosis. These may include:

Thyroid Function Tests (TFTs): Initially, TFTs may show elevated levels of thyroid hormones (T3 and T4) and suppressed thyroid-stimulating hormone (TSH) during the hyperthyroid phase. In the hypothyroid phase, T3 and T4 levels drop, and TSH levels rise.
Inflammatory Markers: Elevated erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) levels indicate inflammation.
Thyroid Antibodies: Low or absent thyroid antibodies help differentiate subacute thyroiditis from autoimmune thyroiditis.

Imaging Studies

Imaging studies such as thyroid ultrasound and radioactive iodine uptake (RAIU) scan can provide additional information:

Thyroid Ultrasound: This may show an enlarged and heterogeneous thyroid gland.
RAIU Scan: This scan typically shows low uptake of radioactive iodine, distinguishing it from other hyperthyroid conditions like Graves' disease.

What Are the Treatment Options for Subacute Thyroiditis?

Treatment for subacute thyroiditis focuses on symptom relief and managing thyroid hormone levels. The following are common treatment approaches:

Pain Management

Nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen or aspirin are often prescribed to alleviate pain and reduce inflammation. In severe cases, corticosteroids like prednisone may be necessary for adequate pain control.

Thyroid Hormone Management

During the hyperthyroid phase, beta-blockers such as propranolol can help manage symptoms like rapid heartbeat and tremors. In the hypothyroid phase, thyroid hormone replacement therapy with levothyroxine may be necessary until the thyroid gland recovers.

Monitoring and Follow-Up

Regular monitoring of thyroid function tests is essential to assess the resolution of the condition and adjust treatment as needed. Most patients recover completely within a few months, although some may experience persistent hypothyroidism requiring long-term hormone replacement.

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What Is the Recovery Process for Subacute Thyroiditis?

Recovery from subacute thyroiditis is generally good, with most patients returning to normal thyroid function within a few months. However, the duration and severity of symptoms can vary.

Prognosis

The prognosis for subacute thyroiditis is excellent, with most patients experiencing complete recovery. However, a small percentage of patients may develop permanent hypothyroidism.

Lifestyle and Support

Patients recovering from subacute thyroiditis should focus on maintaining a healthy lifestyle, including a balanced diet, regular exercise, and stress management. Support from healthcare providers and patient support groups can also aid in recovery.

Subacute Thyroiditis in Pregnancy

Subacute thyroiditis can occur during pregnancy, posing unique challenges. The condition can affect both maternal and fetal health, necessitating careful monitoring and management.

Risks and Management

Pregnant women with subacute thyroiditis require close monitoring of thyroid function and appropriate treatment to ensure optimal outcomes for both mother and baby. Beta-blockers and NSAIDs should be used with caution, and corticosteroids may be considered in severe cases.