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Hyperthyroidism following hypothyroidism. Data on six cases.

V Fatourechi1, H Gharib

  • 1Division of Endocrinology, Metabolism, and Internal Medicine, Mayo Clinic, Rochester, MN 55905.

Archives of Internal Medicine
|April 1, 1988
PubMed
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Spontaneous hyperthyroidism can rarely develop years after a hypothyroidism diagnosis, suggesting an autoimmune link. This rare autoimmune thyroid disorder phenomenon may be underdiagnosed.

Area of Science:

  • Endocrinology
  • Autoimmune Diseases
  • Thyroid Disorders

Background:

  • Autoimmune thyroid disorders, such as hypothyroidism, are common.
  • The development of hyperthyroidism following hypothyroidism is a rare clinical presentation.
  • Understanding the spectrum of autoimmune thyroid disease is crucial for accurate diagnosis and management.

Purpose of the Study:

  • To report on a series of patients presenting with hyperthyroidism after a prior diagnosis of hypothyroidism.
  • To investigate the potential autoimmune mechanisms underlying this rare phenomenon.
  • To highlight the possibility that this condition is more prevalent than currently recognized.

Main Methods:

  • Retrospective case series analysis.
  • Review of clinical data from six patients diagnosed with hypothyroidism who subsequently developed hyperthyroidism.

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  • Assessment of thyroid antibody levels and thyroid gland pathology where available.

    • Main Results:

    • Six patients developed hyperthyroidism 2-20 years (mean 8 years) after hypothyroidism diagnosis.
    • Triiodothyronine toxicosis was the cause of hyperthyroid symptoms in three patients.
    • Evidence of thyroid antibodies and lymphocytic infiltration supported an autoimmune etiology.

    Conclusions:

    • Spontaneous hyperthyroidism can occur as a late complication of hypothyroidism.
    • An autoimmune mechanism is implicated in the development of hyperthyroidism after hypothyroidism.
    • This rare presentation of autoimmune thyroid disease may be underdiagnosed and warrants further investigation.