Ganglions are small sacs (cysts) filled with clear, jelly-like fluid that often appear as bumps on the hands and wrists. They can also develop on feet, ankles, knees, or shoulders. They are not cancerous. A ganglion can grow out of a joint capsule, which surrounds and protects the joint, or a tendon sheath, which covers the tendon (the rope-like fibers connecting muscle to bone). Most people with ganglions notice that the bumps appear suddenly. Follow the links below to read WebMD's comprehensive coverage of ganglions.
Cysts, Lumps, Bumps, and Your Skin
There are a number of skin conditions that cause lumps and bumps to appear. This article covers some of the most common ones.
Skin Cysts and Tumors
WebMD explains causes, symptoms, types, and treatment of skin cysts and tumors.
Ganglion Cyst Basics
WebMD explains the symptoms and treatment of a ganglion cyst, a tumor or swelling on top of a joint, usually the wrist.
Learn about the causes, symptoms, and treatment of hand osteoarthritis, a condition that can make your fingers feel achy and stiff.
Slideshows & Images
A Visual Guide to Understanding Osteoarthritis
Delve into the causes, symptoms, and pain relief treatments of osteoarthritis, also called "wear and tear" arthritis or degenerative joint disease.
Slideshow: Exercises for Osteoarthritis Pain
Lumps and Bumps: What’s on My Skin?
Skin lumps and bumps can pop up from time to time. Learn what’s normal and what to show a doctor.