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Ganglion cyst

Ganglion cysts are noncancerous lumps that most commonly develop along the tendons or joints of your wrists or hands. They also may occur in the ankles and feet. Ganglion cysts are typically round or oval and are filled with a jelly-like fluid.

Small ganglion cysts can be pea-sized, while larger ones can be around an inch (2.5 cm) in diameter. Ganglion cysts can be painful if they press on a nearby nerve. Their location can sometimes interfere with joint movement.

If your ganglion cyst is causing you problems, your doctor may suggest trying to drain the cyst with a needle. Removing the cyst surgically is also an option. But if you have no symptoms, no treatment is necessary. In many cases, the cysts go away on their own.

Symptoms Causes Risk factors

The lumps associated with ganglion cysts can be characterized by:

  • Location. Ganglion cysts most commonly develop along the tendons or joints of your wrists or hands. The next most common locations are the ankles and feet, although these cysts can occur near other joints as well.
  • Shape and size. Ganglion cysts are round or oval and usually measure less than an inch in diameter. Some are so small that they can't be felt. The size of a cyst can fluctuate, often getting larger when you use that joint for repetitive motions.
  • Pain. Ganglion cysts usually are painless. However, if a cyst presses on a nerve — even if the cyst is too small to form a noticeable lump — it can cause pain, tingling, numbness or muscle weakness.

When to see a doctor

If you experience a noticeable lump or pain in your wrist, hand, ankle or foot, see your doctor. He or she can make a diagnosis and determine whether you need treatment.

It's not clear what causes a ganglion cyst to develop. It grows out of a joint or the lining of a tendon, looking like a tiny water balloon on a stalk, and seems to occur when the tissue that surrounds a joint or a tendon bulges out of place. Inside the cyst is a thick lubricating fluid similar to that found in joints or around tendons.

Factors that may increase your risk of ganglion cysts include:

  • Your sex and age. Although ganglion cysts can develop in anyone, they most commonly occur in women between the ages of 20 and 30.
  • Osteoarthritis. People who have wear-and-tear arthritis in the finger joints closest to their fingernails are at higher risk of developing ganglion cysts near those joints.
  • Joint or tendon injury. Joints or tendons that have been injured in the past are more likely to develop ganglion cysts in the future.
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