Adrenal insufficiency occurs when the adrenal glands, which are located on top of the kidneys, fail to produce enough of the essential hormones cortisol and aldosterone. While autoimmune conditions are the primary cause of this failure in the United Kingdom, various external factors such as infectious diseases and specific pharmaceutical treatments can also impair adrenal function. These external triggers can either destroy the adrenal tissue directly or interfere with the complex chemical pathways the body uses to signal hormone production. Understanding these non autoimmune causes is crucial for accurate diagnosis and timely intervention, as the management strategies may differ depending on the underlying trigger of the glandular failure.
What We’ll Discuss in This Article
- The impact of tuberculosis and other systemic infections on adrenal tissue.
- How fungal and viral infections can lead to primary adrenal insufficiency.
- The role of specific medications in suppressing adrenal hormone synthesis.
- The risks associated with the sudden withdrawal of long term steroid treatments.
- How certain drugs used in cancer and antifungal therapy affect the adrenals.
- Frequently asked questions about medication induced adrenal failure.
Infectious Causes of Adrenal Insufficiency
Historically, tuberculosis was the leading cause of Addison’s disease worldwide and it remains a significant factor in global health statistics. In the United Kingdom, although the incidence of tuberculosis has declined significantly due to robust public health measures, it still accounts for a small percentage of adrenal insufficiency cases. When the bacterium that causes tuberculosis spreads through the bloodstream, it can lodge in the adrenal glands, causing chronic inflammation and the formation of granulomas. Over time, this infection leads to the destruction of the adrenal cortex and the eventual calcification of the glands, which can often be seen on an abdominal X ray or CT scan.
Other systemic infections can also lead to acute or chronic adrenal failure. For instance, certain fungal infections such as histoplasmosis or coccidioidomycosis, while rare in the UK, are known to infiltrate the adrenal glands in individuals with compromised immune systems. Additionally, viral infections like cytomegalovirus have been documented to cause adrenalitis, particularly in patients living with advanced HIV. In these cases, the virus directly attacks the adrenal cells, leading to a rapid decline in hormone production. According to clinical data, infectious causes are often characterized by larger, sometimes painful adrenal glands during the acute phase of the infection, followed by shrinkage as the tissue is replaced by scar tissue.
The Impact of Meningococcal Sepsis
A particularly severe and acute infectious cause of adrenal failure is related to meningococcal meningitis and sepsis. This condition can lead to what is medically known as Waterhouse Friderichsen syndrome. In this scenario, the intense systemic inflammation and blood clotting disorders associated with the infection cause massive bleeding into the adrenal glands. This haemorrhage leads to the immediate destruction of the adrenal tissue and a catastrophic drop in cortisol levels.
This form of adrenal failure is a medical emergency that occurs alongside the other severe symptoms of sepsis, such as a high fever and a characteristic purple rash. Because the loss of adrenal function is so sudden, the body cannot compensate, which often leads to a rapid collapse in blood pressure and organ failure. The NHS guidance on sepsis highlights that early recognition of these signs is vital for survival. Patients who survive Waterhouse Friderichsen syndrome often require lifelong hormone replacement therapy because the damage to the adrenal glands is permanent.
Medication Induced Adrenal Suppression
The most frequent medication related cause of adrenal insufficiency in the United Kingdom is the use of glucocorticoid medications, such as prednisolone or hydrocortisone, for other health conditions. These drugs are commonly prescribed to manage inflammation in asthma, rheumatoid arthritis, or inflammatory bowel disease. When a person takes these medications for more than a few weeks, the body detects the high levels of synthetic steroids in the bloodstream. Consequently, the hypothalamus and pituitary gland in the brain stop sending signals to the adrenal glands to produce natural cortisol.
If the steroid medication is stopped suddenly rather than being tapered down slowly, the adrenal glands may be unable to resume their normal function quickly enough. This leads to a state known as secondary adrenal insufficiency, where the glands are physically capable of working but have become inactive due to the lack of stimulation from the brain. The NICE guidelines on safe steroid withdrawal emphasize the importance of gradual dose reduction to allow the adrenal glands to “wake up” and begin producing cortisol again. This process can take several months, and during this time, patients are at risk of an adrenal crisis if they experience a sudden illness or injury.
Drugs That Interfere with Hormone Synthesis
Beyond steroids, certain other medications can directly interfere with the chemical processes the adrenal glands use to create hormones. One well known example is ketoconazole, an antifungal medication. While it is effective at treating fungal infections, at higher doses, it inhibits the enzymes required for the synthesis of cortisol. In some clinical settings, this side effect is actually used intentionally to treat conditions where the body produces too much cortisol, such as Cushing’s syndrome, but if not monitored closely, it can lead to accidental Addison’s disease.
Another medication that can impact adrenal function is etomidate, an anaesthetic agent sometimes used in emergency departments for rapid sedation. Even a single dose of etomidate has been shown to temporarily suppress the production of cortisol for up to twenty four hours. While this is usually not an issue for healthy individuals, it can be dangerous for patients who are already critically ill or septic, as they require high levels of cortisol to maintain their blood pressure. Consequently, medical professionals in the UK are often cautious about using this specific medication in patients at risk of adrenal instability.
Modern Therapies and Immune Checkpoint Inhibitors
In recent years, a new class of cancer treatments known as immune checkpoint inhibitors has been identified as a cause of adrenal insufficiency. These medications, such as nivolumab or ipilimumab, work by “unmasking” cancer cells so the immune system can attack them more effectively. However, a known side effect of this heightened immune activity is that the immune system may also begin to attack healthy endocrine organs, including the pituitary gland or the adrenal glands themselves.
This is referred to as an immune related adverse event. When these drugs cause inflammation of the pituitary gland, it leads to a secondary form of adrenal insufficiency because the signal to produce cortisol is lost. In some cases, the drugs can cause direct adrenalitis, mimicking the autoimmune process seen in traditional Addison’s disease. As the use of these advanced therapies becomes more common in the UK, oncology teams are increasingly vigilant in monitoring patients for signs of hormone deficiency, such as unexplained nausea, dizziness, or profound fatigue.
Comparison of Infectious and Medication Related Triggers
The following table compares how different external factors impact the adrenal system, highlighting the site of the problem and the typical duration of the effect.
| Trigger Type | Specific Example | Site of Impact | Duration of Effect |
| Bacterial Infection | Tuberculosis | Direct damage to adrenal cortex | Permanent destruction |
| Acute Sepsis | Meningococcal meningitis | Adrenal haemorrhage | Permanent and acute |
| Long term Steroids | Prednisolone therapy | Pituitary signaling (Secondary) | Often temporary if tapered |
| Antifungals | High dose Ketoconazole | Enzyme inhibition in the gland | Temporary during treatment |
| Cancer Therapy | Checkpoint inhibitors | Pituitary or Adrenal glands | Often permanent |
While some medication induced causes are temporary and can be reversed once the drug is discontinued or the adrenal glands are given time to recover, most infectious causes lead to permanent tissue loss. This highlights the importance of distinguishing between these causes during the initial diagnostic workup.
Conclusion
Infections and medications are significant non autoimmune causes of adrenal insufficiency that require careful clinical consideration. While tuberculosis and severe sepsis can cause permanent physical destruction of the adrenal glands, the long term use of steroid medications can lead to a suppression of the body’s natural hormone production. Newer medical treatments, such as certain cancer therapies, are also emerging as triggers for adrenal dysfunction. Recognizing these factors is essential for providing appropriate care and ensuring that patients receive the necessary hormone replacement therapy to maintain their health. If you experience severe, sudden, or worsening symptoms, call 999 immediately.
Can a common cold cause Addison’s disease?
No, common viral infections like the cold or flu do not damage the adrenal glands, though they can be dangerous for someone who already has the condition.
Is medication induced adrenal insufficiency permanent?
It depends on the cause. Suppression from steroid use is often reversible with a slow taper, whereas damage from certain cancer drugs may be permanent.
How does tuberculosis reach the adrenal glands?
The bacteria typically travel through the bloodstream from the lungs to other parts of the body, including the adrenals.
Do all steroids cause adrenal suppression?
Most glucocorticoids, when taken in high doses for more than a few weeks, have the potential to suppress natural adrenal function.
Can antifungal creams affect my adrenal glands?
Creams used on the skin are generally not absorbed in high enough quantities to affect hormone production in the adrenal glands.
Why is it dangerous to stop steroids suddenly?
Stopping suddenly leaves the body without enough cortisol to function because the adrenal glands are not yet ready to produce it naturally.
Are there signs that my medication is affecting my adrenals?
Common signs include feeling unusually weak, having low blood pressure, or experiencing dizziness when standing up.
Authority Snapshot (E-E-A-T Block)
The purpose of this article is to inform the public about how infections and medications can influence adrenal function and lead to Addison’s disease. The content has been written by Dr Rebecca Fernandez and reviewed by Dr Stefan, both of whom are highly experienced medical professionals working within the UK health system. All information is grounded in the latest clinical guidelines from the NHS and NICE to ensure its accuracy and relevance for patients in the United Kingdom.
