Health A-Z
Hyperthyroidism
Owner and veterinary guidance with linked treatments and source citations.
Hyperthyroidism
Species: Cat
Breeds Affected: All breeds can develop hyperthyroidism, most commonly in older cats
Clinical review: Veterinary reviewer metadata is not available yet.
Guidance by audience
Use the global Pet owner/Vet toggle in the header. Each mode shows only what that audience needs.
For Pet Owners
Quick summary
Feline hyperthyroidism is a hormonal disorder caused by overproduction of thyroid hormones (T3 and T4) by the thyroid gland, usually due to an adenoma. The excess hormone accelerates metabolism and affects multiple organ systems. Track appetite, hydration, stool/urine changes, energy level, and symptom pattern over time.
Red flags
Call your vet today: Persistent or worsening symptoms. Emergency now: Collapse, severe breathing issues, seizures, uncontrolled bleeding, or severe pain.
What to expect at the vet
Diagnosis should combine history, exam findings, and condition-specific testing.
Prevention checklist
Reduce preventable risk through hygiene, vaccination/preventives when applicable, and routine veterinary follow-up.
For Veterinarians
Diagnostics
Diagnosis should combine history, exam findings, and condition-specific testing.
Differentials
Differential diagnosis considerations are not available yet.
Treatment considerations
Treatment options include anti-thyroid medications, radioactive iodine therapy, surgical thyroidectomy, or an iodine-restricted diet.
Follow-up strategy
Follow-up strategy is not available yet.
What To Do Now
Escalate care quickly if symptoms worsen, persist, or include emergency warning signs.
| Urgency | Signs | Action |
|---|---|---|
| Call your vet today | Persistent or worsening symptoms | Call your veterinarian the same day for guidance and exam scheduling. |
| Emergency now | Collapse, severe breathing issues, seizures, uncontrolled bleeding, or severe pain | Seek emergency veterinary care immediately. |
Prevention Checklist
Reduce preventable risk through hygiene, vaccination/preventives when applicable, and routine veterinary follow-up.
Treatments and Medication Links
Use these medication pages as a reference for options your veterinarian may discuss.
Detailed treatment strategy remains in the Vet view to avoid duplicate narrative blocks.
| Medication | Role | Evidence | Notes |
|---|---|---|---|
| Methimazole | Supportive | Limited | Auto-linked from medication condition map (source=fda_label, confidence=0.950). |
Frequently Asked Questions
FAQ content is not available for this condition yet.
Data Sources
Last updated: February 16, 2026, 11:12 AM UTC
View source list
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Owner_summary · clinical_reference
https://www.merckvetmanual.com/searchresults?query=HyperthyroidismReference search for condition background. -
Triage · clinical_reference
https://www.merckvetmanual.com/searchresults?query=HyperthyroidismClinical triage framing. -
Vet_summary · clinical_reference
https://www.merckvetmanual.com/searchresults?query=HyperthyroidismClinical workflow reference. -
Diagnosis · guideline
https://capcvet.org/?s=HyperthyroidismGuideline discovery link. -
Prevention · public_health
https://www.cdc.gov/search/?query=HyperthyroidismPublic health discovery link. -
Treatment_overview · guideline
https://capcvet.org/?s=HyperthyroidismTreatment guideline discovery link.
Revision History
View revision log
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structured_enrichment2026-02-16 11:12 · etl
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structured_enrichment2026-02-16 11:00 · etl
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structured_enrichment2026-02-15 11:11 · etl
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structured_enrichment2026-02-15 11:00 · etl
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structured_enrichment2026-02-14 11:10 · etl
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structured_enrichment2026-02-14 11:00 · etl
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structured_enrichment2026-02-13 11:11 · etl
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structured_enrichment2026-02-13 11:00 · etl
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structured_enrichment2026-02-13 04:45 · etl
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structured_enrichment2026-02-12 22:47 · etl
Related Media
Related media is not available for this condition yet.
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