Postpartum thyroiditis
Postpartum thyroiditis is a destructive, painless thyroiditis that occurs in the first year after delivery, typically following the same thyrotoxic-then-hypothyroid-then-recovery course as painless thyroiditis, and permanently affects thyroid function in about 20% of cases. Treatment is symptomatic, with a beta-blocker for thyrotoxic symptoms and levothyroxine for a symptomatic or persistent hypothyroid phase, since thionamides and radioactive iodine are not indicated.
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What this article covers
- Overview
The pregnancy-specific form of painless thyroiditis: postpartum thyroiditis is a destructive lymphocytic thyroiditis that releases preformed thyroid hormone, occurring specifically in the first year after delivery.
- Epidemiology
A common postpartum thyroid disorder: thyroid disease, including both hyperthyroidism and hypothyroidism, is common in the year after delivery, and postpartum thyroiditis is the leading cause.
- Risk factors
Positive TPO antibodies during pregnancy: the single strongest predictor of postpartum thyroiditis.
- Pathophysiology
Postpartum immune rebound unmasks or triggers thyroid autoimmunity: the relative immune suppression of pregnancy reverses after delivery, and the resulting immune rebound can trigger lymphocytic…
- Clinical features
Onset within 12 months of delivery: the defining feature that separates this entity from other forms of destructive thyroiditis.
- Differential diagnosis
Painless thyroiditis unrelated to pregnancy: biologically identical but not time-locked to delivery; distinguished purely by timing.
- Diagnosis
The diagnosis is established by thyroid dysfunction developing within 12 months of delivery, with a suppressed TSH and low radioactive iodine uptake in the thyrotoxic phase, or an elevated TSH with…
- Management
First, treat thyrotoxic-phase symptoms with a beta-blocker: metoprolol tartrate 25 mg to 50 mg PO twice daily, titrated to control palpitations and tremor; propylthiouracil-class thionamides and…
- Complications
Permanent hypothyroidism: the most important long-term complication, occurring in about 20% of cases and requiring indefinite levothyroxine.
- Prognosis
Favorable in the majority: most women recover normal thyroid function within the first postpartum year.
- Prevention
Screen women with known TPO antibody positivity or a history of postpartum thyroiditis with TSH testing in each subsequent pregnancy and postpartum period.
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Related articles
- Painless thyroiditis
Painless (silent) thyroiditis is a self-limited destructive thyroiditis, usually arising in patients with underlying autoimmune thyroid disease, that releases preformed hormone in a triphasic pattern of thyrotoxicosis, hypothyroidism, and recovery without a tender gland. Treatment is symptomatic, with a beta-blocker for the thyrotoxic phase and temporary levothyroxine for a symptomatic hypothyroid phase, because thionamides and radioactive iodine have no role.
- Hashimoto thyroiditis
Hashimoto thyroiditis is a chronic autoimmune process in which lymphocytic infiltration destroys the thyroid, and is the most common cause of hypothyroidism in iodine-sufficient regions such as the United States. Diagnosis rests on an elevated thyroid-stimulating hormone with a low or normal free thyroxine, and first-line treatment is lifelong levothyroxine replacement dosed to normalize thyroid-stimulating hormone.
- Subacute granulomatous thyroiditis
Subacute granulomatous (de Quervain) thyroiditis is a painful, tender destructive thyroiditis that follows a viral upper respiratory illness and produces a transient thyrotoxic phase, often followed by a hypothyroid phase, with a markedly elevated erythrocyte sedimentation rate. Treatment is symptomatic, an NSAID for mild pain or a glucocorticoid taper for moderate to severe pain, with a dramatic response within 24 to 48 hours, since thionamides and radioactive iodine have no role.
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Type 1 diabetes mellitus is an insulin-deficient state from autoimmune (type 1A) or idiopathic (type 1B) destruction of pancreatic beta cells, presenting with hyperglycemia that can range from mild to life-threatening diabetic ketoacidosis. Diagnosis combines standard glycemic criteria with autoantibody testing (GAD65, IA-2), and lifelong insulin therapy, generally as a basal-bolus regimen, is required from diagnosis, with self-monitoring or continuous glucose monitoring to guide dosing.