Ganglions - Topic Overview
What are ganglions?
Ganglions are small sacs
(cysts) filled with fluid that often
appear as bumps on the hands and wrists. They can also develop on feet, ankles,
knees, or shoulders. A ganglion can grow out of a
joint capsule, which surrounds the joint,
or a tendon sheath, which covers the
tendon (the fibers connecting muscle to
bone). Ganglions aren't cancerous.
Most people with ganglions notice that the bumps appear suddenly. Bumps may be very small or bigger than a cherry. Ganglions may
get bigger as activity increases and more fluid collects in the sac. They may
also shrink and may break and go away on their own.
Anyone can get a ganglion: adults between 15
and 40 years old are most likely to be affected.1
Children don't usually have ganglions, but if they do, the ganglion will very
likely go away without any treatment.
What causes ganglions?
Experts don't know the
exact cause of ganglions. They may be linked to:
- Inflammation or irritation of the tendon
sheath or joint capsule.
- An injury.
- Overuse or
repetitive motions, such as those you do at work.
- Arthritis. A common type of ganglion called a mucous cyst ganglion occurs with arthritis of the hands. It usually affects the joint nearest the fingernail.
What are the symptoms?
Ganglions are usually
small, painless bumps and do not cause other symptoms.
Sometimes the bump can be tender to the touch, or there can be pain that gets worse with activity or pressure.
If the ganglion puts pressure on nearby nerves, you may have tingling in your fingers,
hand, or forearm. Some ganglions can weaken your grip or affect joint
How are ganglions diagnosed?
A ganglion can
usually be diagnosed based on how it looks and where it is. Your doctor will also feel
the bump and shine a light alongside it. If the bump is a ganglion, the light
usually shines through it.
You may need an
X-ray if your doctor suspects
arthritis or injury.
Some of the fluid found in the ganglion may be removed and examined. In rare
cases, an MRI or
ultrasound may be done.