A phaeochromocytoma is a rare tumour of the adrenal glands, which sit above the kidneys.
The tumour is mainly found in adults, although children can sometimes develop one.
It will usually be non-cancerous (benign), although around 1 in 10 are cancerous (malignant).
It's usually possible to successfully remove a phaeochromocytoma using surgery.
The adrenal glands make the "fight or flight" hormones adrenaline and noradrenaline, which are released into the bloodstream when needed. These hormones control heart rate, blood pressure and metabolism (the chemical processes that keep your organs working).
The symptoms of a phaeochromocytoma tend to be unpredictable, often occurring in sudden attacks lasting from a few minutes to an hour.
The attacks may last longer, and become more frequent and severe, as the tumour grows.
The symptoms and signs of a phaeochromocytoma can include:
Some people with a phaeochromocytoma don't have symptoms, and their condition is either never diagnosed or only discovered during tests for another problem. Others have symptoms for many years before a phaeochromocytoma is diagnosed.
Many phaeochromocytomas occur for no obvious reason and don't run in the family.
However, up to 1 in every 3 occurs as part of an inherited genetic disorder, such as:
These genetic disorders cause different tumours or growths to develop around the body.
If you're diagnosed with a phaeochromocytoma, your doctor may recommend having genetic testing to see if you have any of these disorders.
Diagnosing a phaeochromocytoma can be difficult because the symptoms are quite general and could be caused by many other more common conditions.
An adrenal gland tumour is sometimes discovered during a scan for another reason. In this case, you'd have further tests to find out more about the tumour, which may include:
Cancer Research UK has more information about the tests and scans that are used to help diagnose a phaeochromocytoma.
Most people with a phaeochromocytoma will need surgery to have it removed.
You'll usually be given medication called alpha blockers (and in some cases beta-blockers) for several weeks before the operation. They block the effects of the excess hormones on your body and stabilise your heart rate and blood pressure.
The operation is carried out under general anaesthetic (when you're unconscious). It may be done as:
The incisions will usually be made in your tummy (abdomen).
Your doctor will discuss the best type of operation for you and explain the procedure in detail, including the risks. They'll also answer any questions you have.
If your tumour can't be removed, you'll need medication to manage your condition. This will usually be a combination of medicines to control the effects of the excessive hormones.
Left untreated, phaeochromocytomas can cause severe problems and significantly affect your quality of life.
However, most tumours can be successfully removed by surgery and this will usually mean most of the symptoms disappear.
In a small number of people, the tumour may come back. You'll therefore need regular check-ups following surgery so that, if it does return, it can be picked up and treated as soon as possible. Contact your GP immediately if your symptoms come back.
The Cancer Research UK website has more information about phaeochromocytomas.