An untreated pheochromocytoma presents a significant risk to long term health due to the continuous or episodic flooding of the cardiovascular system with powerful adrenal hormones. While the tumour itself is often benign, the physiological consequences of excessive adrenaline and noradrenaline are anything but harmless. If left unmanaged, these tumours can cause progressive damage to the heart, brain, and kidneys, often leading to life threatening emergencies. In the United Kingdom, medical professionals prioritize early diagnosis and stabilization because the complications of an untreated adrenal tumour are far more dangerous than the surgery required to remove it. Because the hormones cause the body to remain in a constant or frequent state of high alert, the physical toll on the organs is cumulative, meaning that the longer the condition remains hidden, the higher the likelihood of irreversible systemic damage.
What We’ll Discuss in This Article
- The impact of chronic hormone excess on the heart and vascular system.
- Life threatening cardiovascular emergencies, including stroke and heart attack.
- The risk of developing hypertensive crisis and its systemic effects.
- How untreated adrenal tumours can lead to multi organ failure.
- The potential for a benign tumour to eventually manifest as metastatic cancer.
- Neurological and vision related complications from persistent high blood pressure.
- Metabolic disturbances and the increased risk of secondary conditions.
Cardiovascular damage and heart failure
The heart is the primary target of the hormones released by a pheochromocytoma, and chronic exposure can lead to a condition known as catecholamine induced cardiomyopathy. This occurs because the heart muscle is forced to work excessively hard to pump blood against the high pressure caused by constricted blood vessels. Over time, the heart muscle can become thickened, scarred, or weakened, significantly reducing its ability to function effectively. This eventually leads to congestive heart failure, where the heart can no longer meet the body’s demands for oxygenated blood. Symptoms such as persistent shortness of breath, swelling in the legs, and extreme fatigue are often signs that the heart has been structurally altered by the adrenal hormones. According to the NHS guide on heart failure, early intervention is crucial to prevent these changes from becoming permanent.
Hypertensive crisis and acute emergencies
An untreated pheochromocytoma is a leading cause of hypertensive crisis, a medical emergency where the blood pressure reaches levels high enough to damage the organs immediately. These crises often occur during a “paroxysm” or hormone surge and can lead to sudden, catastrophic events such as a haemorrhagic stroke or a myocardial infarction (heart attack). The sudden spike in pressure can cause blood vessels in the brain to burst or cause the coronary arteries to spasm, cutting off blood flow to the heart muscle. In the UK, clinicians emphasize that even if a patient feels well between episodes, the risk of a sudden, fatal hypertensive event remains high as long as the tumour is present. This is why medical stabilization with alpha blockers is initiated as soon as the condition is identified to shield the body from these dangerous surges.
Impact on the kidneys and renal function
The kidneys are highly sensitive to changes in blood pressure, and the persistent hypertension caused by an untreated adrenal tumour can lead to chronic kidney disease. The high pressure damages the delicate filtering units of the kidneys, known as nephrons, making them less efficient at removing waste products from the blood. Additionally, the excess adrenaline can cause the blood vessels within the kidneys to constrict, further reducing blood flow and causing localized tissue damage. In severe cases, a sudden hormone surge can cause acute kidney injury, where the kidneys stop working entirely for a period. Monitoring kidney function through blood and urine tests is a standard part of the care provided by the National Institute for Health and Care Excellence (NICE) to assess the level of systemic damage already caused by the tumour.
Neurological and vision complications
Chronic high blood pressure from an adrenal tumour can have devastating effects on the brain and eyes. Beyond the risk of stroke, untreated hypertension can lead to hypertensive encephalopathy, a condition characterized by brain swelling, severe headaches, confusion, and sometimes seizures. In the eyes, the high pressure can damage the small blood vessels of the retina, a condition called hypertensive retinopathy. This can lead to blurred vision, bleeding within the eye, or even permanent vision loss if the optic nerve is affected. Because these changes can occur gradually, patients might not notice the damage until it is advanced. Specialist eye examinations are frequently used in the UK to check for these “silent” complications in patients with suspected or confirmed pheochromocytoma.
Metabolic disturbances and diabetes
The hormones adrenaline and noradrenaline play a major role in regulating the body’s metabolism, and an untreated tumour can disrupt this balance entirely. Excessive catecholamines interfere with the action of insulin, leading to high blood sugar levels. This condition, often called secondary diabetes, can cause symptoms like increased thirst, frequent urination, and unintended weight loss. While this “diabetes” often resolves once the tumour is removed, leaving it untreated can lead to the same long term complications as Type 2 diabetes, including nerve damage and further vascular issues. The high metabolic state caused by the tumour also puts immense strain on the body’s energy reserves, often leading to profound physical exhaustion that significantly impacts the patient’s quality of life.
The risk of malignancy and spread
While approximately 90 percent of pheochromocytomas are benign, leaving any tumour untreated increases the window of opportunity for it to exhibit more aggressive behaviour. For the 10 percent of tumours that are malignant, delay in diagnosis and treatment allows the cancer cells to spread to other parts of the body, such as the bones, liver, or lungs. Once the condition has become metastatic, it is much more difficult to treat and the focus of care shifts from a complete cure to managing the spread and the symptoms of hormone excess. In individuals with specific genetic mutations like SDHB, the risk of malignancy is higher, making early detection and removal even more critical to prevent the transition from a localized adrenal mass to a systemic cancer.
Multi-organ failure and adrenal crisis
In extreme cases, the cumulative effects of an untreated pheochromocytoma can lead to multi-organ failure. This usually occurs during a severe and prolonged hypertensive crisis where the heart, lungs, kidneys, and brain are all under simultaneous stress. The body’s systems become overwhelmed, and the patient may fall into a coma or experience respiratory failure. This is often the final and most severe complication of an undiagnosed or ignored tumour. In the UK healthcare system, the focus on “biochemical screening” for patients with resistant high blood pressure is specifically designed to catch these tumours before they reach this critical stage. Standardized care pathways ensure that once a tumour is suspected, the patient is moved quickly into a specialist environment to prevent these catastrophic outcomes.
Conclusion
The complications of an untreated pheochromocytoma are severe and involve permanent damage to the heart, kidneys, and brain. Persistent hormone surges can lead to heart failure, stroke, and life threatening hypertensive crises, while metabolic disruptions can mimic or cause diabetes. Although most tumours are benign, the physiological strain they place on the body is cumulative and can eventually lead to multi organ failure. Early diagnosis and surgical intervention are essential to prevent these complications and restore normal health. If you experience severe, sudden, or worsening symptoms, call 999 immediately.
Can the heart damage from an adrenal tumour be reversed?
In many cases, the heart muscle can improve once the tumour is removed and hormone levels return to normal, but long term scarring may remain.
Does high blood pressure from a tumour always lead to a stroke?
It does not always lead to a stroke, but it significantly increases the risk, especially during sudden hormone spikes.
Why does an untreated tumour cause weight loss?
The excess adrenaline increases your metabolic rate, causing your body to burn calories much faster than normal.
Can an untreated pheochromocytoma cause blindness?
Severe, untreated high blood pressure can damage the blood vessels in the retina, which may lead to permanent vision impairment.
Is it possible to have an adrenal tumour for years without knowing?
Yes, some tumours grow slowly and the symptoms may be mistaken for anxiety or other conditions for a long time.
What is the most common cause of death from an untreated pheochromocytoma?
The most common causes are cardiovascular events, such as heart failure, heart attack, or stroke.
Does everyone with a tumour eventually get diabetes?
Not everyone, but many patients develop high blood glucose levels because the adrenal hormones interfere with how insulin works.
Authority Snapshot
This article highlights the significant health risks and potential complications of leaving a pheochromocytoma untreated in the adrenal glands. It has been prepared by Dr. Rebecca Fernandez and adheres strictly to the clinical guidelines and patient safety standards set by the NHS and NICE. The content is designed to inform patients about the critical importance of early diagnosis and medical management of rare endocrine tumours within the United Kingdom’s medical framework.
