Final answer:
Adrenal insufficiency, or Addison's disease, is characterized by reduced cortisol production, different from hypothyroidism, pituitary gland deficiencies, and Cushing's disease.
Explanation:
Adrenal insufficiency, or Addison's disease, is characterized by reduced production of cortisol from the adrenal gland. Hypothyroidism, Pituitary gland deficiencies, and Cushing's disease all involve hormonal imbalances but are not forms of adrenal insufficiency.
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