Yes, it is possible to have Addison's disease for years and not know. This is because Addison's disease is an endocrine disorder that often has few, if any, symptoms, or the symptoms may be so mild that they are mistaken for something else.
The common symptoms of Addison's disease are fatigue, weight loss, low blood pressure, muscle weakness, nausea or vomiting, darkening of the skin, and low blood sugar. However, these symptoms can also be caused by other medical conditions, so they are often misdiagnosed. In addition, some people may not experience any symptoms at all.
If you have any of the symptoms of Addison's disease, you should see your doctor for a proper diagnosis. Your doctor will likely perform a physical exam, order blood and urine tests, and possibly take an imaging scan of your adrenal glands. If the tests come back positive for Addison's disease, your doctor may also perform additional tests to determine the cause and severity of the disorder.
Once diagnosed, Addison's disease is usually treated with a combination of medications, dietary and lifestyle changes, and stress-management techniques. With proper treatment, people with Addison's disease can lead healthy and fulfilling lives.