Cat Acromegaly and Insulin Resistance

Feline acromegaly, caused by a pituitary tumor secreting excess growth hormone, is an underdiagnosed cause of insulin-resistant diabetes in cats.

Key Facts

Acromegaly in cats is caused by a benign pituitary adenoma in most cases
Growth hormone excess causes progressive enlargement of the jaw, paws, and organs
Affected cats develop severe insulin resistance making diabetes very difficult to control
The condition is more common in middle-aged to older male cats
IGF-1 blood levels are used as an initial screening test
Advanced imaging (MRI or CT) confirms the pituitary tumor
Radiation therapy can shrink tumors and restore insulin sensitivity
Without treatment, progressive organomegaly leads to heart and kidney failure

Welfare Considerations

Cats with acromegaly suffer from poorly controlled diabetes causing high blood sugar levels, excessive thirst, and weight changes despite eating well. Progressive organ enlargement causes discomfort and eventually organ failure. The condition is frequently missed for months or years while owners struggle with uncontrolled diabetes, meaning cats suffer needlessly from inadequate treatment. Early diagnosis changes outcomes dramatically.

What You Can Do

Ask your vet to screen for acromegaly if your diabetic cat has poor insulin response
Advocate for IGF-1 testing to be included in diabetic cat workups
Support veterinary endocrinology research into feline hormonal disorders
Learn about radiation therapy options available at specialist centers
Join feline diabetes owner communities to share management experience