This book focuses on the regulation, function and further research insights on aldosterone. Chapter One discusses the role of aldosterone in the causation of cardiac oedema and highlights areas for potential future research. Chapter Two reviews secondary arterial hypertension due to primary hyperaldosteronism. Chapter Three summarises the present knowledge about the role of aldosterone in stress adaptation with special emphasise to age-dependent changes. Chapter Four presents an overview of the effects of aldosterone, focusing on nongenomic actions in the kidney.