The main symptom of a ganglion cyst is a swelling in the area affected. They tend to be smooth and round and can vary in size. Some can be large and prominent, while others are so small that you can't feel or see them. Sometimes they shrink or grow and may even disappear altogether, only to reappear at a later date. If a ganglion cyst puts pressure on a nerve, you may experience discomfort or altered movement.
Attribution: BUPA