Thyroid inflamations

  • Painful acute and subacute thyroiditis
  • Postpartum thyroiditis following pregnancy
  • Rare conditions such as “silent thyroiditis” and the fibrous Riedel’s thyroiditis, which are not discussed here.

Postpartum Thyroiditis:

This is an autoimmune thyroid inflammation similar to Hashimoto’s thyroiditis, occurring after childbirth (in approximately 10% of women following pregnancy). A characteristic feature is an initial phase of hyperthyroidism, which can last up to six months. This phase is typically managed with beta-blockers rather than antithyroid drugs.

In about 30% of women, this is followed by a permanent hypothyroidism that requires ongoing treatment. However, in the majority of affected women, the thyroiditis resolves without any lasting effects, which is rarely observed in classic Hashimoto’s thyroiditis.

Acute Thyroiditis

Acute Thyroiditis

Summary:

  • Acute thyroiditis is a rare, typically bacterial inflammation of the thyroid gland.
  • Symptoms: Sudden neck and throat pain, thyroid swelling, fever, chills, redness, and warmth over the thyroid gland, and difficulty swallowing.
  • Treatment: Prompt antibiotic therapy ensures full recovery without long-term effects.

Details:
Acute thyroiditis is an inflammatory condition of the thyroid gland, usually caused by bacterial infection. Pathogens typically spread to the thyroid via the bloodstream from infections in the upper respiratory tract, skin, or other inflammatory sites. This condition is relatively rare and can occur at any age, though it is more common in adults.

Causes:

  • Most commonly, bacterial infections spread via the bloodstream (hematogenous spread) or directly from nearby structures such as the pharynx.
  • Rarely, fungal or parasitic infections may occur, particularly in immunocompromised individuals.

Symptoms:

  • Sudden onset of pain in the neck and throat
  • Thyroid swelling
  • Fever and chills
  • Pain radiating to the jaw or ears
  • Redness and warmth over the thyroid gland
  • Difficulty swallowing (dysphagia)
  • General malaise

Diagnosis:

  • Blood Tests: Elevated inflammatory markers (e.g., C-reactive protein (CRP), elevated erythrocyte sedimentation rate (ESR)).
  • Thyroid Function Tests: T3 and T4 levels are usually normal, but TSH may be elevated.
  • Imaging: Thyroid ultrasound often shows irregular, hypoechoic (dark) areas.
  • Fine-Needle Aspiration (FNA): Used to collect thyroid cells or pus for microbiological testing.

Treatment:

  • Antibiotics: To eliminate bacterial infection.
  • Pain and Fever Management: Analgesics and antipyretics for symptom relief.
  • Abscess Drainage: Required in severe cases with pus accumulation.

Prognosis:

  • With timely and appropriate treatment, acute thyroiditis typically resolves without lasting damage.
  • Delayed treatment can lead to complications such as thyroid abscess, requiring surgical drainage.
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Subacute Thyroiditis

Subacute Thyroiditis (De Quervain’s Thyroiditis)

Summary:

  • Subacute thyroiditis, also known as De Quervain’s thyroiditis, often occurs after viral infections.
  • Symptoms: Sudden anterior neck pain radiating to the jaw or ears, thyroid swelling and tenderness, fever, and fatigue.
  • Treatment: Anti-inflammatory drugs (NSAIDs) or corticosteroids in severe cases.
  • Prognosis: Most recover fully within months, but some progress to Hashimoto’s thyroiditis with permanent hypothyroidism.

Details:
Subacute thyroiditis is an inflammatory condition of the thyroid, often following viral infections. It is also referred to as giant cell thyroiditis due to the presence of multinucleated “giant cells” in biopsy samples. Fine-needle aspiration is rarely needed for diagnosis. The cause is presumed to be viral infection of the thyroid.

Causes:

  • Frequently associated with viral upper respiratory infections (e.g., influenza, adenoviruses, Coxsackieviruses).
  • Autoimmune reactions may also play a role.

Symptoms:

  • Sudden pain in the front of the neck, radiating to the jaw, ears, or chest.
  • Thyroid swelling and tenderness.
  • Fever, general malaise, and muscle pain.
  • Initial phase of hyperthyroidism, often followed by a phase of hypothyroidism.

Diagnosis:

  • Clinical Examination and History: Typical symptoms and recent viral infection history.
  • Blood Tests: Elevated inflammatory markers (CRP, ESR).
  • Thyroid Function Tests: Elevated T3 and T4 during the hyperthyroid phase, followed by low levels during the hypothyroid phase.
  • Ultrasound: Shows irregular, hypoechoic (dark) areas.
  • Scintigraphy: Not necessary for diagnosis.

Treatment:

  1. Pain Management:
    • NSAIDs (e.g., ibuprofen, acetaminophen) for pain and inflammation.
  2. Corticosteroids:
    • Required in most cases (e.g., prednisone).
    • Initial dose: ~1 mg/kg body weight daily for 1–2 weeks, followed by gradual tapering over weeks to months.
    • Tapering is crucial to prevent relapse and allow the body to adjust its hormone production.
    • Regular monitoring for symptoms, side effects, and blood markers (inflammatory markers, thyroid function) is essential.
    • Long-term corticosteroid use may cause side effects such as high blood pressure, increased blood sugar, osteoporosis, and weight gain, so the lowest effective dose for the shortest duration is recommended.
  3. Beta-Blockers:
    • To manage symptoms of hyperthyroidism.
  4. Thyroid Hormone Replacement:
    • Levothyroxine may be needed during the hypothyroid phase.

Prognosis:

  • Most patients recover completely within a few months.
  • Temporary hypothyroidism may occur, often resolving on its own.
  • Frequently, subacute thyroiditis progresses to Hashimoto’s thyroiditis with permanent hypothyroidism requiring lifelong thyroid hormone replacement.
  • Recurrences are rare but possible.