One way the body keeps itself in balance is by using chemical messengers called hormones to regulate various functions. Just above each of your kidneys is a small adrenal gland. These glands make hormones essential to a healthy life. When they don't make enough of these hormones, Addison's disease is the result.
Addison's disease is a rare condition. Only one in 100,000 people has it. It can happen at any age to either men or women. People with Addison's disease can lead normal lives as long as they take their medication. President John F. Kennedy had the condition.
In Addison's disease, the adrenal glands don't make enough of a hormone called cortisol, or less often, a related hormone called aldosterone. That's why doctors sometimes call the illness ''chronic adrenal insufficiency,'' or hypocortisolism.
Cortisol's most important function is to help the body respond to stress. It also helps regulate your body's use of protein, carbohydrates, and fat; helps maintain blood pressure and cardiovascular function; and controls inflammation. Aldosterone helps your kidneys regulate the amount of salt and water in your body -- the main way you regulate blood volume and keep your blood pressure under control. When aldosterone levels drop too low, your kidneys cannot keep your salt and water levels in balance. This makes your blood pressure drop.
There are two forms of Addison's disease. If the problem is with the adrenal glands themselves, it's called primary adrenal insufficiency. If the adrenal glands are affected by a problem starting somewhere else -- such as the pituitary gland -- it's called secondary adrenal insufficiency.
What Causes Addison's Disease?
Most cases of Addison’s disease result from a problem with the adrenal glands themselves (primary adrenal insufficiency). Autoimmune disease accounts for 70% of Addison’s disease. This occurs when the body's immune system mistakenly attacks the adrenal glands. This autoimmune assault destroys the outer layer of the glands.
Long-lasting infections -- such as tuberculosis, HIV, and some fungal infections -- can harm the adrenal glands. Cancer cells that spread from other parts of the body to the adrenal glands also can cause Addison's disease.