Feline Hyperthyroidism

image of Online Vet Training instructor Yi Cui Yi Cui, DVM, Dip ECVIM-ca
Available on April 14, 2026
Course includes:
icon of dog
Duration: 1 hour

Diagnosis and Treatment Strategies

This webinar is available from April 15 2026.

This webinar provides a comprehensive overview of feline hyperthyroidism, the most common endocrine disorder in older cats. The session begins with a review of thyroid physiology and the mechanisms underlying excessive thyroid hormone production, most commonly caused by adenomatous hyperplasia or adenoma of the thyroid gland. Epidemiology and risk factors, including age, environmental influences, and dietary factors, are also discussed.

Participants will learn how to recognize the typical clinical manifestations of the disease, such as weight loss despite polyphagia, gastrointestinal signs, behavioral changes, cardiovascular abnormalities, and thyroid enlargement. The webinar explains how hyperthyroidism affects multiple organ systems, including the cardiovascular and renal systems, and highlights common comorbidities such as chronic kidney disease and hypertrophic cardiomyopathy.

A structured diagnostic approach is presented, focusing on interpretation of thyroid hormone testing, including total T4, free T4, and TSH, as well as additional diagnostic tests when results are equivocal. The session also reviews treatment options, including medical management with antithyroid drugs, radioactive iodine therapy, surgical thyroidectomy, and iodine-restricted diets. Advantages, limitations, monitoring strategies, and potential complications such as iatrogenic hypothyroidism are discussed to help clinicians select the most appropriate treatment for each patient.

image of Online Vet Training instructor Yi Cui Yi Cui, DVM, Dip ECVIM-ca

Yi completed her veterinary studies and internship in 2013 at the University of Ghent and obtained her specialization in Internal Medicine in 2019 in Giessen (Germany). She then worked as a clinical supervisor in the Department of Internal Medicine at the University of Giessen.

Yi built an extensive academic career in various university hospitals. She had the opportunity to work with renowned professors in her field at the universities of Ghent, Utrecht and Bern, each time in the role of specialist in Internal Medicine. In 2022, she worked for a year at the largest private veterinary clinic in Hong Kong, where she became acquainted with the ins and outs of practice outside the university.

Exploring new environments, learning from and working with different experts and experiencing new cultures was always central and essential to her personal growth. That is why she decided to explore the world, together with her partner, their adorable cat Nidalee and adventurous dog Harper, bit by bit, country by country. Yi has been working online since 2023, as a consultant for primary care veterinarians on challenging cases and as a lecturer for various courses in her field. She also remains practically active through locums in clinics around the world. She supplements this with volunteer work at various local animal shelters.


Yi schloss 2013 ihr Studium der Tiermedizin sowie ihr Internship an der Universität Gent ab und erlangte 2019 ihre Spezialisierung in der Inneren Medizin in Gießen (Deutschland). Anschließend arbeitete sie als klinische Supervisorin in der Abteilung für Innere Medizin an der Universität Gießen.

Yi baute eine umfangreiche akademische Laufbahn an verschiedenen Universitätskliniken auf. Sie hatte die Möglichkeit, mit renommierten Professorinnen und Professoren ihres Fachgebiets an den Universitäten Gent, Utrecht und Bern zusammenzuarbeiten, jeweils in der Funktion als Spezialistin für Innere Medizin. Im Jahr 2022 arbeitete sie ein Jahr lang in der größten privaten Tierklinik in Hongkong, wo sie wertvolle Einblicke in die Arbeit außerhalb des universitären Umfelds gewann.

Das Erkunden neuer Umgebungen, das Lernen von und Arbeiten mit unterschiedlichen Expertinnen und Experten sowie das Erleben neuer Kulturen waren stets zentrale Elemente ihrer persönlichen Entwicklung. Aus diesem Grund entschied sie sich, gemeinsam mit ihrem Partner, ihrer Katze Nidalee und ihrem abenteuerlustigen Hund Harper die Welt Schritt für Schritt, Land für Land, zu bereisen. Seit 2023 arbeitet Yi online als Beraterin für Erstlinien-Tierärztinnen und -Tierärzte bei komplexen Fällen sowie als Referentin für verschiedene Fortbildungen in ihrem Fachgebiet. Zudem bleibt sie durch Vertretungstätigkeiten in Tierkliniken weltweit praktisch tätig und ergänzt dies durch ehrenamtliche Arbeit in lokalen Tierschutzorganisationen.

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