Addison's disease occurs when the adrenal glands do not produce enough cortisol and sometimes aldosterone. It can affect people of any age, gender or time. Symptoms include changes in blood pressure, chronic diarrhea, weakness and weight loss. Tests show increased potassium, low blood pressure and low cortisol levels. Treatment involves taking medications to replace corticosteroids and mineralocorticoids to control symptoms. Famous president John F. Kennedy suffered from Addison's disease.