Ganglion cysts

A ganglion forms when the jelly-like fluid that lubricates a joint or tendon balloons out through a small weakness in its lining, collecting in a sac under the skin. A one-way flow tends to keep the sac filled, which is why these lumps can swell, shrink and sometimes reappear. In most cases there is no clear trigger, and you have done nothing to cause it.

Ganglions are common and usually harmless. They occur most often around the wrist and hand, and tend to affect younger and middle-aged adults, being a little more frequent in women. Repetitive hand use and underlying wear in a nearby joint can make them more likely, but many arise for no obvious reason.

Ganglion cysts vary in how they present. Features may include:

• A smooth, rounded lump near a joint or tendon, often at the wrist
• A lump that may change in size, sometimes appearing and disappearing
• Usually no pain, though some cause aching or restrict movement depending on their position

A ganglion can often be recognised from the examination. Confirming what the lump is provides reassurance and rules out other causes.

Ultrasound is very useful here. It can confirm that a lump is a fluid-filled ganglion rather than something else, which is reassuring, and helps guide any treatment. Dr Borukhson uses point-of-care ultrasound during the consultation, so the lump can often be assessed in the same visit. You can read more on the ultrasound clinic page.

Many ganglion cysts need no treatment, particularly if they are not causing problems, and some settle on their own. Where a cyst is uncomfortable or restricting movement, the fluid can sometimes be drawn off, which ultrasound guidance helps perform accurately. Persistent or troublesome cysts may be referred for consideration of removal. The right approach is discussed with you.

For most people a ganglion needs no special care beyond gentle reassurance, as these lumps are harmless. If it is painless and not limiting you, it is reasonable simply to keep an eye on it, knowing that persisting or returning does not mean anything has gone wrong.

Helpful everyday measures include:

• Modifying activities that clearly aggravate it, while keeping the wrist and hand moving normally
• Using a soft wrist support for short periods if a task brings on aching
• Noting any change in size or comfort, so you can describe it accurately if reviewed

Please resist old remedies such as striking the lump, which can bruise the area without helping. If it begins to trouble you, assessment is the safer route.

A ganglion is rarely an emergency, but some features are worth prompt review rather than waiting. Arrange to be seen sooner if you notice:

• Numbness, pins and needles, or weakness in the hand or fingers, which can suggest the cyst is pressing on a nearby nerve
• A lump that is growing quickly, or becoming hard or fixed, as this may not be a simple ganglion and should be checked promptly
• Redness, warmth or increasing pain, particularly with feeling unwell, which points to other causes rather than a simple ganglion

For a longstanding, painless lump that is not troubling you, routine assessment is perfectly reasonable. Nerve-related symptoms overlap with conditions such as carpal tunnel syndrome, so it is sensible to have these checked.

A new lump is understandably a cause for concern, and assessment most often provides reassurance that it is a harmless ganglion, while identifying the occasional case that needs more attention. If you have a lump near a joint or tendon, a specialist review, with ultrasound where helpful, can confirm what it is.

How is a ganglion cyst diagnosed?

A ganglion can often be recognised from the history and examination, as it tends to be a smooth, rounded lump near a joint or tendon that may shine when light is held against it. Confirming what the lump is provides reassurance and rules out other causes. Ultrasound is very useful here, showing whether it is a simple fluid-filled cyst. Dr Borukhson uses point-of-care ultrasound during the consultation, so the lump can often be assessed in the same visit.

Will a ganglion cyst go away on its own?

Many do. Ganglions are harmless, and a good number settle by themselves over time without any treatment, particularly when they are not causing trouble. There is no need to rush into anything if the lump is painless and not restricting you. If it becomes uncomfortable, grows, or limits movement, it is sensible to have it assessed so the options can be discussed rather than simply waiting.

Should I try to burst or hit a ganglion cyst myself?

No, please do not. An old remedy was to strike the lump with a heavy book, but this is not advised. It can cause bruising or injury and rarely cures the cyst, which often returns. If a ganglion is bothering you, a proper assessment is far safer and more effective. Where treatment is wanted, the fluid can be drawn off accurately under ultrasound guidance, and the right approach is discussed with you.

When should I see a specialist about a lump near my wrist or hand?

A new lump is understandably worrying, and a specialist review most often provides reassurance that it is a harmless ganglion. It is worth being seen if the lump is painful, growing, changing in appearance, restricting movement, or simply causing you concern. An assessment, with ultrasound where helpful, can confirm what it is in one visit and identify the occasional case that needs closer attention.