Cats with hyperthyroidism often develop other health issues such as high blood pressure (hypertension) and kidney disease. Recent studies show that hyperthyroidism in cats can contribute to the development or progression of kidney disease. Hyperthyroidism is a hormonal disorder in which the thyroid becomes hyperactive and produces too much hormone. This accelerates metabolism, overstimulates the heart muscle and can lead to high blood pressure. The increased renal blood flow reduces the effectiveness of kidney filtration and can lead to proteinuria and reduced kidney function over time. Supplements such as Renelix, Power Probiotic and Kidney Health can support kidney function. Olive Leaf Extract and Purrfect Pet CoQ10 are helpful for blood pressure regulation.