What condition is caused by inadequate production of antidiuretic hormone (ADH)?

Diabetes insipidus is characterized by inadequate production of antidiuretic hormone (ADH), which is crucial for regulating fluid balance within the body. When ADH levels are low, the kidneys are unable to concentrate urine effectively, leading to excessive urination (polyuria) and increased thirst (polydipsia). This condition can result from either damage to the hypothalamus or pituitary gland, where ADH is produced, or from the kidney's insensitivity to ADH.

In contrast, diabetes mellitus is a metabolic disorder primarily related to insulin regulation rather than ADH deficiency. Hypopituitarism refers to decreased hormone production from the pituitary gland; while this can affect ADH levels, it is a broader term encompassing multiple hormone deficiencies. Hyperthyroidism involves an excess of thyroid hormone production, which is also unrelated to ADH levels. Thus, the condition specifically identified by inadequate production of ADH is diabetes insipidus.