Quick answer. A ganglion cyst is a benign, fluid-filled lump that most often appears on the wrist or hand. It is not cancer, is usually harmless, and can often be left alone unless it causes pain, weakness or bothers you.
A ganglion cyst is one of the most common lumps to appear around the wrist and hand. It is a soft, fluid-filled swelling that arises from a joint or tendon sheath, and although a new lump can be worrying, a ganglion cyst is benign, meaning it is not cancer. Many people first notice one as a smooth bump on the back of the wrist that may change in size over time.
This guide explains what a ganglion cyst is, why it forms, how doctors confirm the diagnosis and what the treatment choices are, from simply watching it to aspiration or surgical removal. It also covers when a lump should be checked by a doctor. While ganglion cysts are usually harmless, any new or changing lump is worth having assessed so you can be reassured and treated appropriately.
At a glance
| Option | What it involves | Best suited for |
|---|---|---|
| Watchful waiting | Monitoring the cyst without treatment | Painless cysts that do not affect function |
| Activity adjustment | Reducing repetitive strain, splinting at times | Cysts that ache with certain activities |
| Aspiration | Draining the fluid with a needle in clinic | Bothersome cysts where surgery is not preferred |
| Surgical excision | Removing the cyst and its stalk | Painful, recurring or function-limiting cysts |
| Reassurance only | Confirming it is benign and harmless | Cysts confirmed as typical ganglion cysts |
What is a ganglion cyst?
A ganglion cyst is a non-cancerous, fluid-filled sac that develops next to a joint or tendon, most commonly on the back or front of the wrist, but also on the hand, fingers, ankle or foot. It contains a thick, jelly-like fluid similar to the lubricating fluid found inside joints and tendon sheaths.
Ganglion cysts are very common and can appear at any age, though they are seen often in younger and middle-aged adults and more frequently in women. The key thing to know is that a ganglion cyst is benign, it is not a tumour or cancer, and many cause no symptoms at all. Some disappear on their own over time without any treatment.
Symptoms & signs
Many ganglion cysts cause no trouble beyond their appearance, but some can be uncomfortable depending on where they are. Typical features include:
- A smooth, round or oval lump near a joint, often on the wrist or hand
- A lump that may feel firm or springy and can change in size
- Mild aching or discomfort, particularly with movement or pressure
- Occasionally, weakness or reduced grip if the cyst presses on nearby structures
- A lump that may become more or less prominent with activity or rest
The fact that a ganglion can shrink and swell, or even vanish and return, is characteristic and usually reassuring.
Causes & risk factors
The exact cause of ganglion cysts is not fully understood, but they are thought to form when the fluid that lubricates a joint or tendon sheath leaks out and collects in a sac. This may be linked to minor wear, irritation or stress on the joint or tendon over time.
Factors that may raise the likelihood of developing a ganglion cyst include repetitive use of a joint, previous injury to the area, and underlying joint conditions such as osteoarthritis in the affected joint. They are more common in women and in adults between their twenties and forties, although anyone can develop one. Importantly, ganglion cysts are not caused by anything dangerous and are not contagious.
How it is diagnosed
A doctor can often diagnose a ganglion cyst from its appearance and feel during a physical examination. A simple in-clinic test is to shine a light through the lump, as the clear fluid inside typically lets light pass through, unlike a solid lump. To confirm the diagnosis or rule out other causes, a doctor may use:
- An ultrasound scan to confirm the lump is fluid-filled
- Occasionally an MRI scan, if the diagnosis is unclear or the cyst is deep
- Aspiration, where some fluid is drawn out, which can also help confirm the diagnosis
These checks help reassure you that the lump is a harmless ganglion and not something that needs more concern.
Treatment options
Because ganglion cysts are harmless, treatment is only needed if the cyst is painful, limits movement or bothers you. Options include:
- Watchful waiting: many cysts cause no problems and some go away on their own, so observation is often the first choice
- Activity changes and splinting: reducing repetitive strain and resting the joint can ease discomfort
- Aspiration: draining the fluid with a needle in clinic, though the cyst can come back afterwards
- Surgical excision: removing the cyst along with its stalk, usually considered for cysts that are painful, recurrent or affecting function
Your doctor will discuss which approach suits you, taking into account symptoms, location and your preferences. Even after treatment, a ganglion can sometimes recur.
When to see a doctor & which specialist
A ganglion cyst is usually harmless, but it is sensible to have any new lump checked so you can be reassured it is not something else. See a doctor if a lump:
- Is painful, is growing, or is interfering with movement or grip
- Feels hard or fixed rather than soft and movable
- Is changing in a way that concerns you, or you are simply unsure what it is
Seek prompt care, and go to A&E or call 995, in the rare event of sudden severe pain with redness, spreading swelling and fever, which could suggest infection. For assessment and treatment of wrist and hand lumps, an orthopaedic surgeon or hand specialist can help. Find one through our directory of orthopaedic surgeons in Singapore.
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- Best Orthopaedic Clinics in Singapore — our editorial shortlist
- orthopaedic clinics directory
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Sources
- HealthHub Singapore – Health conditions
- SingHealth – Hand conditions
- NHS – Ganglion cyst
- Mayo Clinic – Ganglion cyst
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