Addison’s Disease: Low Cortisol Symptoms, Causes, and Emergency Warning Signs

Addison’s disease is a form of primary adrenal insufficiency in which the adrenal glands do not make enough cortisol and often too little aldosterone. It usually develops gradually, but in some cases it can lead to a sudden adrenal crisis that needs urgent medical care.

Overview of Addison’s Disease

Addison’s disease is a rare disorder in which the adrenal glands do not produce enough hormones, especially cortisol and often aldosterone. The adrenal glands are small glands located above the kidneys. These hormones help the body respond to stress, maintain blood pressure, balance salt and fluids, and support normal energy use.

The condition is also called primary adrenal insufficiency. In primary adrenal insufficiency, the problem starts in the adrenal glands themselves. This is different from secondary adrenal insufficiency, where the pituitary gland does not send enough adrenocorticotropic hormone, or ACTH, to stimulate the adrenal glands.

Addison’s disease often develops slowly, and symptoms may be vague at first. Because tiredness, appetite loss, and weight changes are common in many illnesses, diagnosis can sometimes be delayed. Once identified, however, the condition can usually be managed well with regular hormone replacement and careful follow-up.

Symptoms of Low Cortisol and Low Aldosterone

Symptoms of Addison’s disease often begin gradually and may worsen over time. Low cortisol can cause persistent tiredness, muscle weakness, reduced appetite, unintentional weight loss, nausea, abdominal discomfort, and difficulty coping with physical or emotional stress. Some people also notice low mood or trouble concentrating.

When aldosterone is also low, the body may lose too much sodium and retain too much potassium. This can lead to low blood pressure, dizziness when standing, salt craving, dehydration, and weakness. People may feel faint, especially during hot weather, illness, or after vomiting or diarrhea.

One well-known sign of Addison’s disease is darkening of the skin, called hyperpigmentation. This may appear in skin folds, scars, elbows, knees, knuckles, gums, or areas exposed to friction. Not everyone develops this sign, but when it occurs it can be a helpful clue that the adrenal glands are the source of the problem.

• Ongoing fatigue and weakness
• Loss of appetite and weight loss
• Nausea, vomiting, or abdominal pain
• Low blood pressure and dizziness
• Salt craving
• Skin darkening in some people

Causes and Risk Factors

The most common cause of Addison’s disease in many regions is autoimmune adrenalitis. In this condition, the immune system mistakenly attacks the adrenal glands and gradually damages the outer layer, called the adrenal cortex. This reduces production of cortisol and aldosterone over time.

Other causes include infections such as tuberculosis, bleeding into the adrenal glands, cancer that spreads to the glands, certain inherited disorders, and damage related to surgery or severe illness. In some people, Addison’s disease occurs as part of a broader autoimmune syndrome that may also involve the thyroid, pancreas, or other glands.

Risk factors can include a personal or family history of autoimmune disease. People with autoimmune thyroid disease, type 1 diabetes, or certain other endocrine conditions may have a higher chance of developing autoimmune adrenal insufficiency. A doctor may also consider related hormone problems if symptoms overlap with conditions such as Cushing’s syndrome or other disorders affecting hormone balance.

Emergency Warning Signs: Addisonian Crisis

An Addisonian crisis, also called an adrenal crisis, is a sudden and dangerous worsening of adrenal insufficiency. It can happen in someone whose Addison’s disease has not yet been diagnosed, or in someone already on treatment who faces major stress without enough extra steroid replacement. Triggers may include infection, fever, surgery, injury, severe dehydration, vomiting, or stopping steroid medicine abruptly.

Warning signs include severe weakness, confusion, fainting, very low blood pressure, severe vomiting or diarrhea, intense abdominal or back pain, and signs of dehydration. Some people may become drowsy or collapse. This is a medical emergency because the body cannot maintain blood pressure and fluid balance normally.

Anyone with suspected adrenal crisis should seek urgent medical care immediately. Emergency treatment usually includes fast-acting steroid medication, intravenous fluids, and treatment of the trigger, such as infection. Rapid recognition can be lifesaving, and people with known adrenal insufficiency are usually advised to carry emergency information and medication instructions.

How Addison’s Disease Is Diagnosed

Diagnosis begins with a careful medical history and physical examination. A doctor will ask about symptoms such as fatigue, appetite loss, dizziness, skin darkening, and episodes of faintness or vomiting. Blood pressure, hydration status, and signs of other autoimmune disease may also be assessed.

Blood tests are central to diagnosis. They may show low sodium, high potassium, low cortisol, and a high ACTH level in primary adrenal insufficiency. The ACTH stimulation test is commonly used to confirm the diagnosis by checking how the adrenal glands respond to synthetic ACTH. Additional blood tests may help look for autoimmune antibodies or related hormone problems.

Imaging tests such as CT scanning may be used when the cause is unclear or when infection, bleeding, or another structural problem is suspected. Since hormone disorders can overlap, doctors may also evaluate the thyroid or pituitary gland and use diagnostic imaging when it is clinically needed to understand the underlying reason for adrenal failure.

Treatment Options and Long-Term Care

The main treatment for Addison’s disease is lifelong hormone replacement. This usually includes a glucocorticoid medicine to replace cortisol and, in many people, a mineralocorticoid medicine to replace aldosterone. Treatment is tailored to the individual, and regular follow-up helps ensure symptoms are controlled without replacing too much or too little hormone.

During times of physical stress, such as fever, surgery, or injury, the body normally needs more cortisol. Because people with Addison’s disease cannot increase production naturally, doctors teach them how and when to adjust steroid doses during illness. This is often called sick-day management. It is an important part of preventing adrenal crisis.

Follow-up visits may include review of symptoms, blood pressure, weight, electrolyte levels, and overall wellbeing. Some people may also benefit from coordinated care in endocrinology and metabolic diseases services, especially if they have more than one hormone condition. For selected patients, evaluation may also include related hormonal disorders such as adrenal insufficiency more broadly.

Near the end of the care pathway, patients and families are often encouraged to keep an emergency steroid card or medical alert identification. Acibadem International’s multidisciplinary specialists and JCI-accredited hospitals diagnose and treat Addison’s disease for international patients, with care plans based on individual medical needs.

Prevention, Self-Care, and Living Well

Addison’s disease itself usually cannot be prevented, especially when it is caused by autoimmunity. However, complications can often be reduced with education, regular treatment, and knowing how to respond to illness or stress. Taking medicines exactly as prescribed is essential, even when symptoms improve.

People living with Addison’s disease should learn their personal sick-day plan from their doctor. This may include increasing steroid medicine temporarily during fever or infection, seeking medical help if vomiting prevents tablets from being kept down, and carrying emergency contact information. Medical alert jewelry can be helpful in emergencies.

General self-care also matters. Staying hydrated, attending follow-up appointments, and reporting new symptoms early can support better day-to-day stability. Some people may need advice before surgery, dental work, or long travel. If weakness, dizziness, or repeated vomiting occur, prompt medical guidance is important rather than trying to manage alone.

When to See a Doctor

A doctor should evaluate ongoing unexplained fatigue, weight loss, low blood pressure, salt craving, or repeated nausea and abdominal discomfort, especially when these symptoms occur together. Skin darkening, fainting episodes, or worsening dizziness when standing are also reasons to seek medical assessment.

People already diagnosed with Addison’s disease should contact a healthcare professional if symptoms are no longer well controlled, if they are unsure how to adjust medicines during illness, or if they have repeated vomiting or diarrhea. Review is also important before surgery or after any major injury.

Emergency medical help is needed for possible adrenal crisis. Signs include severe weakness, collapse, confusion, severe vomiting, dehydration, or very low blood pressure. Early treatment is important and can prevent serious complications.

Frequently asked questions

What is Addison’s disease?

Addison’s disease is a type of primary adrenal insufficiency. It happens when the adrenal glands do not make enough cortisol and often too little aldosterone, which affects energy, blood pressure, and the body’s response to stress.

Is Addison’s disease the same as adrenal insufficiency?

Addison’s disease is one form of adrenal insufficiency, specifically primary adrenal insufficiency. Adrenal insufficiency can also be secondary or tertiary, when the problem comes from reduced hormone signaling from the brain rather than direct damage to the adrenal glands.

What are the first symptoms of Addison’s disease?

Early symptoms are often subtle and may include tiredness, muscle weakness, reduced appetite, weight loss, dizziness, and nausea. Because these symptoms are not specific, the condition may be mistaken for other health problems at first.

Why does skin darkening happen in Addison’s disease?

Skin darkening can happen because the body produces more ACTH when cortisol levels are low. High ACTH levels can stimulate pigment-producing cells, leading to darker skin in folds, scars, knuckles, or the mouth.

Can Addison’s disease be cured?

Addison’s disease usually cannot be cured when the adrenal glands are permanently damaged. However, it can usually be managed effectively with lifelong hormone replacement and regular medical follow-up.

What is an Addisonian crisis?

An Addisonian crisis is a sudden, severe shortage of cortisol that causes very low blood pressure, dehydration, vomiting, weakness, confusion, or collapse. It is a medical emergency and needs urgent treatment with steroids and fluids.

Can people with Addison’s disease live a normal life?

Many people with Addison’s disease can live active, full lives when the condition is diagnosed and treated properly. Good long-term management includes taking medicine regularly, learning sick-day rules, and seeking quick help for emergency warning signs.

References

• National Institute of Diabetes and Digestive and Kidney Diseases
• NHS
• Mayo Clinic
• Endocrine Society
• MedlinePlus

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.