Bone cyst

Bone cysts are fluid-filled holes that form in bones. They mainly affect children and teenagers. They're not usually serious, but they sometimes need to be treated with surgery.

Symptoms of a bone cyst

Symptoms of a bone cyst can include:

Bone cysts do not always cause symptoms. Sometimes they're found after they cause a fracture, or if you have an X-ray for another reason.

Treatments for bone cysts

If the bone cyst is small

A bone cyst may not need treatment if it's small and not causing any problems.

They often get better on their own, especially in children and teenagers.

You may have regular X-rays for a few years to check your bone is healing and the cyst is not getting bigger.

If the bone cyst is large or causing problems

A bone cyst might need to be treated if it's:

The main treatments are:

Treatment is done under general anaesthetic. You will not usually need to stay in hospital overnight.

Recovering after treatment for a bone cyst

If you have treatment for a bone cyst it normally takes at least a few months for the bone to heal.

You may need to avoid activities or sports that could damage the bone until it has healed.

You'll have regular X-rays for a few years to check it's getting better.

It's quite common for bone cysts to come back, especially in the first couple of years after treatment.

Non-urgent advice: See a GP if:

  • you get a lump, pain or swelling after treatment for a bone cyst

This could mean the cyst has come back or you've developed an infection from surgery.

Causes of bone cysts

The exact cause of bone cysts is unknown. They're not cancer and do not spread to other parts of the body.

The main types of cyst are thought to have different causes:

Page last reviewed: 21 July 2023
Next review due: 21 July 2026