Addison's Disease: Complete Guide to Adrenal Insufficiency Symptoms, Causes & Treatment
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: September 2026
Quick Answer
Addison's disease, also called primary adrenal insufficiency, is a rare condition in which the adrenal glands stop making enough of the hormones cortisol and often aldosterone. It develops slowly over months, and the earliest signs are usually extreme tiredness, salt cravings, and unexplained weight loss. Because cortisol is essential for handling stress, an untreated flare-up called an adrenal crisis can become life-threatening. With daily lab-made hormone replacement, most people can manage the condition and live a normal life.
TL;DR
What it is: A rare disorder where the adrenal glands make too little cortisol (and often aldosterone).
Main cause: An autoimmune reaction that damages the outer layer (cortex) of the adrenal glands.
Early symptoms: Extreme fatigue, dizziness on standing, salt craving, weight loss, and darkened skin.
The big risk: An adrenal crisis triggered by illness or injury, a medical emergency.
Treatment: Daily corticosteroid tablets to replace cortisol and aldosterone, plus an emergency steroid injection kit.
Outlook: Very good with consistent treatment and regular medical follow-up.
Addison's Disease at a Glance
Other name: Primary adrenal insufficiency.
What happens: Adrenal glands make too little cortisol; often too little aldosterone too.
Most common cause: Autoimmune attack on the adrenal cortex.
Who it affects: Anyone. It is rare.
How it starts: Slowly, often over months.
Key early symptoms: Extreme tiredness, salt cravings, weight loss, darkened skin.
Dangerous complication: Adrenal crisis (addisonian crisis), a medical emergency.
Main treatment: Daily hormone replacement tablets plus extra sodium.
Is it curable? No, but it is very manageable with lifelong treatment.
Can it be prevented? No, but adrenal crises can be prevented with planning.
Note: This article is for general information only and is not a substitute for professional medical advice. Always consult a qualified healthcare professional for diagnosis and treatment.
What Is Addison's Disease?
Addison's disease is a rare condition that happens when the body doesn't make enough of certain hormones. Its medical name is primary adrenal insufficiency. The problem starts in the adrenal glands, two small glands that sit on top of the kidneys.
Despite their tiny size, these glands control a surprising amount of what happens in the body. In Addison's disease, they produce too little cortisol, the hormone that helps the body turn food into energy, handle stress, and support the immune system. They often also make too little aldosterone, the hormone that balances sodium and potassium to keep blood pressure healthy.
The good news is that treatment works. Taking lab-made hormones replaces the missing ones, and Addison's disease can affect anyone. It is not something a person brings on themselves. Without treatment, however, it can be life-threatening, which is why early recognition matters.
Adrenal Glands 101: What the Adrenals Do
To understand Addison's disease, it helps to know what the adrenal glands actually do. They are part of the endocrine system, the network of glands and organs that makes hormones, and their output affects almost every organ and tissue in the body.
Each adrenal gland has two layers, and each layer has a different job:
Cortex (outer layer): cortisol and other glucocorticoids. Turn food into energy, support the immune system, and drive the body's stress response.
Cortex (outer layer): aldosterone (a mineralocorticoid). Balances sodium and potassium to keep blood pressure in a healthy range.
Cortex (outer layer): androgens (small amounts of sex hormones). Support male sexual development, muscle mass, body hair, sex drive, and a sense of well-being.
Medulla (inner layer): adrenaline. Controls the body's fight-or-flight response to stress.
In Addison's disease, the cortex, the outer layer, is damaged and can't make enough hormones. The medulla is not the main problem.
Addison's Disease Symptoms: How It Starts and Develops
Addison's disease symptoms usually develop slowly, often over months. The condition can creep up so gradually that people ignore the early signs, which is exactly why it is sometimes diagnosed late. Physical stress, such as an illness or an injury, can make symptoms worsen very quickly.
Early Symptoms That Affect Your Energy and Comfort
The first signs tend to show up as discomfort and low energy:
Extreme tiredness (fatigue): the most common early signal
Dizziness or fainting when standing after sitting or lying down, caused by a type of low blood pressure called postural hypotension
Sweating due to low blood sugar (hypoglycemia)
Upset stomach, diarrhea, or vomiting
Abdominal pain
Muscle cramps, weakness, widespread pain, or joint pain
Early Symptoms That Change How You Look
Addison's disease can also change your appearance:
Body hair loss
Darkened skin, especially on scars and moles (these patches may be harder to see on Black or brown skin)
Weight loss caused by a reduced appetite
Early Symptoms That Affect Mood and Emotions
The hormone shortage can also affect mental health and desires:
Depression
Irritable mood
Lower sex drive in women
Salt craving: a distinctive sign that many people overlook
Adrenal Crisis: The Emergency You Must Never Ignore
Sometimes Addison's disease symptoms worsen suddenly and severely. This emergency is called an adrenal crisis (also known as an addisonian crisis or acute adrenal failure). Normally, the adrenal glands respond to physical stress by making two or three times their usual amount of cortisol. With Addison's disease, the glands simply cannot meet that demand, and the result can be fatal without fast treatment.
Call 911 or your local emergency number immediately if you have Addison's disease and develop any of these symptoms:
Serious weakness
Sudden, severe pain in the lower back, stomach, or legs
Severe upset stomach, vomiting, or diarrhea
Extreme dehydration (loss of body water)
Fever
Confusion or greatly reduced awareness of surroundings
Loss of consciousness
Low blood pressure and fainting
An adrenal crisis produces low blood pressure, low blood sugar, and high blood potassium all at once, and it requires treatment right away.
When to See a Doctor
You don't have to wait for an emergency. See a healthcare professional if you notice any of these persistent signs:
Long-lasting fatigue
Muscle weakness
Loss of appetite
Darkened areas of skin
Unintentional weight loss
Severe upset stomach, vomiting, or stomach pain
Lightheadedness or fainting when standing
Salt cravings
And remember: if any adrenal crisis symptom appears, seek emergency care right away.
Addison's Disease Causes: Why the Adrenal Glands Fail
Damage to the adrenal glands causes Addison's disease, and the most common reason for that damage is the body's own immune system. Understanding why the glands fail also explains why the replacement treatment works.
The Main Cause: Autoimmune Disease
Most often, Addison's disease is an autoimmune disease, a condition in which the immune system attacks healthy tissue by mistake. Here, it attacks the cortex of the adrenal glands. People with Addison's disease are more likely than others to have a second autoimmune condition as well.
Other Causes
While autoimmunity is the top cause, several other factors can destroy or impair the adrenal glands:
Tuberculosis: a serious infection that mainly affects the lungs but can also destroy the adrenal glands
Other infections of the adrenal glands
Cancer that has spread to the adrenal glands
Bleeding into the adrenal glands
Congenital adrenal hyperplasia: a group of genetic conditions present at birth that affect the adrenal glands
Certain medicines: drugs that block the body's ability to make glucocorticoids (such as ketoconazole, mitotane, and etomidate) or block glucocorticoid action (such as mifepristone)
Checkpoint inhibitor drugs used in cancer treatment
Primary vs. Secondary Adrenal Insufficiency
It's worth knowing the difference between the two main types of adrenal insufficiency, because they have different causes and slightly different symptom patterns:
Primary (Addison's disease): The problem starts in the adrenal glands themselves. The damaged cortex can't make hormones. Darkened skin is common, dehydration and low blood pressure are more likely, and low blood sugar is possible. Common causes include autoimmune disease, infections, bleeding, genetics, and some drugs.
Secondary adrenal insufficiency: The problem starts in the pituitary gland near the brain, which makes too little ACTH (adrenocorticotropic hormone), so the adrenal cortex isn't prompted to make its hormones. Darkened skin does not occur, dehydration and low blood pressure are less likely, and low blood sugar is more likely. Common causes include non-cancer pituitary tumors, pituitary surgery or radiation, brain injury, and suddenly stopping corticosteroid medicines.
An important and often overlooked trigger of secondary adrenal insufficiency: people who take corticosteroid medicines for conditions like asthma or arthritis must taper off slowly under medical guidance. Stopping these medicines suddenly, rather than tapering, can lead to secondary adrenal insufficiency.
Addison's Disease Risk Factors
Most people who develop Addison's disease have no identifiable risk factors at all. That said, certain histories can raise the risk of adrenal insufficiency:
A previous disease or surgery affecting the pituitary gland or the adrenal glands
Genetic changes affecting either gland, including the gene changes behind congenital adrenal hyperplasia
Other autoimmune endocrine conditions, such as hypothyroidism or type 1 diabetes
Traumatic brain injury
Notice the pattern: the risk factors cluster around prior gland damage, genetics, and autoimmunity, which mirrors the causes themselves.
How Addison's Disease Is Diagnosed
Diagnosing Addison's disease starts with a conversation. Your healthcare professional reviews your medical history and symptoms, then orders tests that can confirm adrenal insufficiency and determine whether it is primary (Addison's) or secondary.
Blood test: checks levels of sodium, potassium, cortisol, and ACTH, plus antibodies that point to an autoimmune cause.
ACTH stimulation test: measures cortisol in the blood before and after an injection of lab-made ACTH, which tells the adrenal glands to produce cortisol.
Insulin-induced hypoglycemia test: checks blood sugar and cortisol levels after an insulin injection; used to see whether the pituitary gland is causing secondary adrenal insufficiency.
CT scan of the abdomen: looks at the size of the adrenal glands and any other issues in the stomach area.
MRI of the pituitary gland: looks for damage near the brain that could cause secondary adrenal insufficiency.
The ACTH stimulation test is the cornerstone: if the adrenal glands still respond to ACTH by releasing cortisol, they are intact; if they don't, adrenal insufficiency is confirmed.
Addison's Disease Treatment: Daily Hormone Replacement
The goal of treatment is simple: correct the steroid hormone levels your body isn't making. This is done with daily medicine, not surgery, and most people respond very well.
The Core Medicines
Hydrocortisone (Cortef), prednisone (Rayos), or methylprednisolone (Medrol) replace cortisol. They are taken by mouth, on a daily schedule that mimics the body's natural 24-hour cortisol rhythm.
Fludrocortisone acetate replaces aldosterone. It is taken by mouth.
Because treatment doses only replace what's missing, people with Addison's disease are not likely to experience the serious side effects associated with the high-dose corticosteroids used for other illnesses. Still, regular follow-up is important to confirm the dose is never too high.
Sodium, Stress, and Sick-Day Rules
Daily life with Addison's disease involves a few practical habits:
Eat plenty of sodium, especially during heavy exercise, hot weather, or digestive troubles such as diarrhea.
Raise your dose short-term when your body is stressed. Surgery, infection, or even a minor illness can demand more cortisol. Your healthcare professional will teach you how.
If you are vomiting and can't keep your medicine down, you may need corticosteroid shots. Don't wait it out.
Living Safely with Addison's Disease
Five daily safety habits make the condition highly manageable:
Carry a medical alert card and bracelet at all times. A steroid emergency card lets first responders know exactly what care you need. Keep a written action plan too.
Keep extra medicine handy. Missing even one day can be dangerous. Store a small supply at work and take extra when you travel.
Carry a corticosteroid injection kit. This contains a needle, syringe, and injectable corticosteroids for emergencies.
Stay in contact with your healthcare professional. Hormone levels are monitored, and doses or timing can be adjusted if needed.
Have yearly checkups, ideally with an endocrinologist (a hormone specialist), who may also recommend yearly screening for other autoimmune diseases.
Emergency Treatment of an Addisonian Crisis
An addisonian crisis is a medical emergency treated with medicines and solutions given through a vein (IV):
Corticosteroids
Saline solution to restore fluids and blood pressure
Sugar to correct low blood glucose
Preventing a Crisis Before It Happens
Addison's disease itself cannot be prevented, but you can dramatically lower your risk of a crisis:
Talk with your healthcare professional if you always feel tired or weak or are losing weight without trying, and ask whether you should be tested for adrenal insufficiency.
If you already have Addison's disease, ask what to do when you're sick. You'll likely learn how to adjust your dose, and you may need to take the medicine as a shot during illness.
If you become very sick, especially if vomiting means you can't take your medicine, go to an emergency room. This step is crucial.
Preparing for Your Appointment
You will likely start with a primary healthcare professional, who may refer you to an endocrinologist, a doctor who treats hormone-related conditions. A little preparation makes the visit far more productive.
Take a family member or friend along if you can; a second set of ears helps you remember the information you receive. Before the appointment, prepare four lists:
Your symptoms and when they began
Key personal information, including major stresses or recent life changes
All medicines, vitamins, and supplements you take, including doses
Questions to ask, for example: What is likely causing my symptoms? What tests do I need? Is my condition likely short-term or long-lasting? What is the best course of action? How can I manage my other health conditions together with this? Are there restrictions I need to follow?
Expect your doctor to ask whether your symptoms are constant or occasional, how severe they are, and what makes them better or worse.
Frequently Asked Questions (FAQ)
What is Addison's disease?
Addison's disease, also called primary adrenal insufficiency, is a rare condition in which the adrenal glands make too little of the hormones cortisol and aldosterone. Because cortisol controls energy, stress response, and immune function, the shortage causes gradual fatigue, weight loss, and other widespread symptoms. Without treatment it can be life-threatening, but daily hormone replacement makes it manageable.
What causes Addison's disease?
In most cases, an autoimmune disease causes the body's immune system to attack the outer layer (cortex) of the adrenal glands by mistake. Other causes include tuberculosis, other infections, cancer spreading to the glands, bleeding into the glands, genetic conditions present at birth, and certain medicines. Most people who develop it have no known risk factors at all.
What are the first signs of Addison's disease?
The earliest symptoms usually appear slowly over months and include extreme tiredness, dizziness or fainting when standing, salt cravings, unexplained weight loss, muscle weakness, and upset stomach. Distinctive signs are darkened skin (especially on scars and moles) and reduced appetite. Because the onset is gradual, these signs are often missed or ignored at first.
What is an adrenal crisis and is it dangerous?
An adrenal crisis (addisonian crisis) is a life-threatening emergency in which the body suddenly cannot meet its cortisol needs during physical stress such as illness or injury. It causes severe weakness, vomiting, dehydration, fever, confusion, fainting, low blood pressure, low blood sugar, and high potassium. It requires immediate emergency treatment with IV corticosteroids, saline, and sugar.
How is Addison's disease diagnosed?
Doctors diagnose it through blood tests measuring sodium, potassium, cortisol, and ACTH, plus an ACTH stimulation test that checks whether the adrenal glands can produce cortisol when stimulated. An insulin-induced hypoglycemia test can reveal secondary causes involving the pituitary gland, while CT and MRI imaging examine the adrenal glands and the pituitary directly.
Can Addison's disease be cured or prevented?
No. Addison's disease cannot be cured or prevented, but it is highly treatable. Daily oral corticosteroids replace the missing cortisol and aldosterone, and with consistent medication, sick-day planning, and an emergency injection kit, most people live normal lives. The main goal is preventing an adrenal crisis through careful daily management.
Conclusion
Addison's disease is a reminder of how much depends on two small glands. The three lessons worth carrying away are: early symptoms develop slowly and are easy to miss (fatigue, salt cravings, darkened skin), an adrenal crisis is a true emergency that demands immediate care, and treatment works: daily hormone replacement restores balance for most people.
This guide walked you through how the adrenal glands work, what goes wrong in Addison's disease, how it is diagnosed, and how to live safely with it day to day. If you are noticing persistent, unexplained fatigue or any of the signs described here, the most valuable next step is a simple conversation with your healthcare professional.
References
This content is provided for general informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of a qualified healthcare provider with any questions about a medical condition.
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