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Thyroid-stimulating Hormone Suppression

Thyroid-stimulating hormone (TSH) suppression is a treatment strategy, mainly for selected differentiated thyroid cancers. It uses thyroid hormone to reduce growth stimulation of remaining thyroid cells, while balancing harms from hormone excess.

Key takeaways

  • The TSH target is individual and may change with cancer response, recurrence risk, age, heart health and bone risk.
  • TSH and free thyroid-hormone tests guide dosing; symptoms alone cannot show whether suppression is adequate or excessive.
  • Excess suppression can contribute to atrial fibrillation, palpitations, bone loss, anxiety, tremor or sleep problems.

Catalogue matches do not set a TSH target or indicate a safe levothyroxine dose.

Who may need suppression?

Benefit is greater for some higher-risk or persistent differentiated thyroid cancers than for low-risk disease with an excellent response. The oncology and endocrine team reviews pathology, imaging and tumour markers over time.

How is levothyroxine used safely?

Levothyroxine replaces thyroid hormone and, at a sufficient dose, lowers pituitary TSH. Absorption, other medicines, pregnancy and adherence affect results. Monitoring under thyroid health care prevents a fixed historical target continuing after risk changes.

When to seek urgent care

Seek urgent care for chest pain, fainting, severe breathlessness, a sustained rapid or irregular heartbeat, confusion or marked weakness during suppressive therapy.