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Post Partum Thyroiditis
Related Subjects: |Thyrotoxicosis and Hyperthyroidism |Thyroid Storm - Thyrotoxic crisis |Graves Disease (Thyrotoxicosis) |Amiodarone and Thyroid disease |Thyroid Surgery (Thyroidectomy) |Hypothyroidism |Hashimoto's thyroiditis |DeQuervain's thyroiditis |Subacute Thyroiditis |Thyroid nodule |Congenital Hypothyroidism |Thyroid Function Tests and antibodies |Post partum thyroiditis |Sick Euthyroid Syndrome |Thyroid Exam (OSCE) |Thyroid Gland anatomy and Physiology |Thyroid Cancer
⚠️ Postpartum thyroiditis may be misdiagnosed as postnatal depression - always consider TFTs in new mothers with fatigue, mood changes, or unexplained physical symptoms.
📖 About
- Occurs within 12 months after delivery, often transient.
- Classically biphasic: hyperthyroidism → hypothyroidism → recovery.
- 20% of women who enter the hypothyroid phase develop permanent hypothyroidism.
🧬 Aetiology
- Autoimmune lymphocytic thyroiditis, often with anti-TPO antibodies.
- Increased risk with Type 1 diabetes, previous thyroid disease, autoimmune disorders.
🧫 Histology
- Lymphocytic infiltration of thyroid, mild follicular disruption.
🩺 Clinical Features
- Minimal thyroid enlargement, usually painless.
- Hyperthyroid phase: palpitations, tremor, anxiety, heat intolerance, weight loss.
- Hypothyroid phase: lethargy, cold intolerance, dry skin, weight gain, depression-like symptoms.
🔎 Investigations
- TFTs:
- Hyperthyroid: ↑ T4, ↓ TSH
- Hypothyroid: ↓ T4, ↑ TSH
- Anti-TPO antibodies: positive in most cases.
⚕️ Management
- Hyperthyroid phase: usually self-limiting. Beta-blockers for symptom relief; antithyroid drugs not required.
- Hypothyroid phase: T4 replacement if symptomatic or persistent; withdraw after 12 months to assess recovery.
- Monitoring: TFTs every 6–8 weeks until stable.
- Most recover within 12–18 months.
📋 Screening TFTs
Check thyroid function in high-risk groups:
- Atrial fibrillation
- Dyslipidaemia
- Type 1 diabetes, pregnancy, postpartum
- Amiodarone or lithium therapy (6-monthly)
- Down’s and Turner’s syndromes
- Addison’s disease
📊 Interpreting Thyroid Function Tests
| Diagnosis | TSH | T3 | T4 |
|---|---|---|---|
| Hypothyroid (primary) | High | - | Low |
| Treated hypothyroid | High | - | Normal |
| TSH-secreting tumour | High | - | High |
| Slow T4→T3 conversion | High | Low | High |
| Hyperthyroid | Low | High | High |
| Subclinical hyperthyroid | Low | Normal | Normal |
| Central hypothyroid | Low | - | Low |
| Sick euthyroid / pituitary disease | Low | Low | Low |
| Assay/drug effect (e.g. amiodarone) | Normal | - | Abnormal |
💡 Interpretation pearl: In primary thyroid disease, TSH and T4 move in opposite directions. In central disease, TSH and T4 move in the same direction.
📚 Reference
| The content on this website is provided for educational and informational purposes only to support exam preparation (e.g., MLA, MRCP, USMLE) and learning. This is NOT medical advice, diagnosis, treatment, or professional guidance. It does not replace consultation with a qualified healthcare professional, official guidelines (e.g., NICE, GMC, BNF), or supervised clinical practice. Always verify information with current, authoritative sources. Makindo and its contributors accept no liability for any reliance on this content, including errors, omissions, or any resulting harm, loss, or consequences. By using this site, you agree to these terms. |
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