Another major impact of hyperthyroidism involves its effect on the kidneys.

The kidneys act like filters, cleaning blood by eliminating waste and keeping fluid levels balanced. Kidney disease is very common in older cats. Hyperthyroidism can ‘mask’ this issue temporarily, since extra thyroid hormone boosts blood flow, enhancing filtration. Test results might suggest kidney performance is stronger than reality.

Once treatment of hyperthyroidism begins, thyroid levels normalise. For cats with kidney issues, this shift can expose underlying problems. Suddenly, lab tests reveal elevated waste markers like creatinine or urea, signalling compromised function.

Treatment doesn’t create kidney disease. It unveils what was already there. That’s why checking kidneys beforehand and tracking them post-treatment is crucial. A complete examination including a urine sample and blood pressure check will allow your vet to paint a fuller picture.

Hyperthyroidism’s link to kidney disease may seem unsettling, but addressing it remains vital. Ignoring hyperthyroidism risks severe heart, blood pressure, and organ damage. With careful monitoring cats can stay healthy and have an improved quality of life after their hyperthyroidism is treated.