Thyroid hormone is produced by the thyroid gland and is essential for regulating metabolism, growth, and development.

Hypothyroidism is the most common endocrine disorder in older adults, affecting approximately 10% of the population.

Insulin is produced by the pancreas and is responsible for regulating blood sugar levels.

Autoimmune disease is the most common cause of hypothyroidism in older adults, accounting for approximately 90% of cases.

Estrogen is produced by the ovaries and is responsible for regulating the menstrual cycle and fertility in women.

Graves' disease is the most common cause of hyperthyroidism in older adults, accounting for approximately 70% of cases.

Adrenocorticotropic hormone (ACTH) is produced by the pituitary gland and is responsible for regulating the production of cortisol, which helps the body respond to stress.

Pituitary tumor is the most common cause of Cushing's syndrome in older adults, accounting for approximately 70% of cases.

Growth hormone-releasing hormone (GHRH) is produced by the hypothalamus and is responsible for regulating the production of growth hormone, which is essential for growth and development.

Pituitary tumor is the most common cause of growth hormone deficiency in older adults, accounting for approximately 70% of cases.

Prolactin-releasing hormone (PRH) is produced by the hypothalamus and is responsible for regulating the production of prolactin, which is essential for milk production in women.

Pituitary tumor is the most common cause of prolactinoma in older adults, accounting for approximately 90% of cases.

Vasopressin is produced by the hypothalamus and is responsible for regulating the production of antidiuretic hormone (ADH), which helps the body regulate water balance.

Head injury is the most common cause of diabetes insipidus in older adults, accounting for approximately 50% of cases.

Oxytocin is produced by the hypothalamus and is responsible for regulating the production of oxytocin, which is involved in social bonding, reproduction, and lactation.