Final answer:
Hypervolemic hyponatremia results from conditions that cause water and sodium retention, such as heart failure and liver cirrhosis, leading to diluted blood sodium and excessive fluid volume.
Step-by-step explanation:
Hypervolemic hyponatremia is caused by conditions that lead to excessive fluid volume, combined with diluted blood sodium levels. This imbalance can result from water and sodium retention due to various medical conditions such as heart failure, liver cirrhosis, certain kidney diseases, hyperaldosteronism, or the use of glucocorticoid steroids. Additionally, imbalances involving antidiuretic hormone (ADH) and aldosterone contribute to the condition. To correct hypervolemic hyponatremia, it's important to address the underlying cause and restore homeostasis.