Painful, stiff, and sometimes disfigured fingers are signs of arthritis, which often affects the hands. Of the different types of arthritis, osteoarthritis is the most common. It occurs when cartilage (the smooth material that covers the ends of bones in joints) breaks down. The ends of bones rub together, causing pain and loss of movement over time. The rubbing can also cause the formation of bony bumps called osteophytes.
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