Avery has high blood pressure and hypernatremia (excess blood sodium ion concentration). the hypersecretion of which hormone could lead to his condition?

The hormone aldosterone is one of the causes of hypernatremia, which in layman's terms is excessive blood sodium ion concentration. Aldosterone is typically secreted naturally in the body by adrenal glands and sometimes in excess by benign (non-cancerous) adrenal tumors.