All have risks and benefits. They do this by stopping production of a pain-causing substance in the body, but they don't interfere with similar substances that act to protect the stomach lining. Some doctors now use them for first-line treatment in people with moderate to severe arthritis pain. But these heavily promoted drugs are expensive, and are so new that the long-term side effects are not completely known. If you have arthritis and are doing well on nonprescription pain relievers, there's no need to switch.
Heat can help.
Or apply a heating pad or hot packs to stiff joints. Some people cannot tolerate it. These never seem to lack for advocates. There's no scientific evidence that any of them can be helpful, but at least they are cheap and harmless. Don't substitute them for effective treatments.