Final answer:
Adrenal insufficiency, or Addison's disease, is a condition characterized by reduced cortisol production from the adrenal gland. It can be primary or secondary, and symptoms include low blood pressure, weakness, fatigue, salt cravings, and high blood potassium levels. Treatment involves cortisol replacement therapy.
Step-by-step explanation:
Adrenal insufficiency, also known as Addison's disease, is characterized by reduced production of cortisol from the adrenal gland. It can be primary (due to malfunction of the adrenal glands) or secondary (due to decreased availability of ACTH from the pituitary). Symptoms include low blood pressure, weakness, fatigue, salt cravings, and high blood potassium levels (hyperkalemia). Diagnosis involves blood and imaging tests, and treatment requires cortisol replacement therapy.