The adrenal glands, located on top of the kidneys, make hormones that are essential for body functions. The outer layer (cortex) of the adrenal glands makes three types of steroid hormones. In adrenal insufficiency (AI), the cortex does not make enough steroid hormones.
There are two kinds of AI:
Primary AI, also called Addison's disease. In this rare condition, the adrenal glands do not work properly and cannot make enough cortisol (a “stress” hormone). Usually, production of aldosterone and androgens (the other hormones made by the adrenal glands) is also low.
Secondary AI. This far more common type of AI results when the pituitary gland, a small gland near the brain, does not signal the adrenal glands to make cortisol.
The adrenal glands do not get “adrenal fatigue” or lose function because of mental or physical stress. True AI is a rare health problem. Only an endocrinologist, an expert in hormones, should diagnose it using standard tests.
The most common cause of primary AI is autoimmune disease, meaning the body's defense system attacks and destroys the body's own tissues. When adrenal glands are damaged, they can't produce hormones. Other causes of primary AI include bleeding in the glands, infections, genetic (inherited) diseases, and surgical removal of the adrenal glands.
Problems with the pituitary gland cause secondary AI. Normally, the pituitary gland makes a hormone called ACTH, which tells the adrenal glands to make cortisol. But in secondary AI, the pituitary gland does not send ACTH to the adrenal glands. No cortisol is made.
Some causes of secondary AI may be temporary, such as taking certain prescription medicines like prednisone, hydrocortisone, or dexamethasone. Other causes may be permanent. These include tumors in the pituitary, surgical or radiation damage to the pituitary.
Symptoms (what you feel) begin little by little. They include fatigue, muscle weakness, decreased appetite, and weight loss. Some people experience nausea, vomiting, and diarrhea. Other symptoms include:
Some people don't know they have AI until they have a sudden worsening of symptoms called an adrenal crisis.
Physical stress caused by illness, infection, surgery, or an accident can suddenly make symptoms of AI much worse, an emergency illness called an adrenal crisis. If untreated, adrenal crisis can cause death. Adrenal crisis occurs mainly in people with primary AI.
People in adrenal crisis need an injection (shot) of glucocorticoids (medicines that replace cortisol) right away. Then they need to go to the hospital for more treatment.
If you have AI, you should know the warning signs of adrenal crisis. They include:
You also should tell family and friends what to do if a crisis occurs. Always wear a medical alert bracelet or tag.
Doctors review a patient's symptoms and medical history. They check blood levels of cortisol, other hormones, sodium, potassium, and glucose to detect AI and help find the cause. They also look at the adrenal glands or the pituitary gland with imaging tests, such as x-rays, ultrasound, and CT or MRI scans.
The goal of treatment is to ensure proper hormone levels day-to-day. You may need daily replacement of hormones for life. You will take glucocorticoids to replace the cortisol your body no longer makes. You may also need mineralocorticoids, if your body does not make aldosterone.
Extra glucocorticoids may be needed during times of stress, such as serious illness or surgery. Your doctor will provide personalized advice on adjusting medicines for stress. Understanding your disease and knowing when and how to adjust your medications can help you live a long and healthy life with AI.
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