Feline hyperaldosteronism is a disease in cats. The symptoms are caused by abnormally high concentrations of the hormone aldosterone,[1] which is secreted by the adrenal gland. The high concentrations of aldosterone may be due directly to a disorder of the adrenal gland (primary hyperaldosteronism), or due to something outside of the adrenal gland causing it to secrete excessive aldosterone (secondary hyperaldosteronism).