Voltaren Extra Strength Arthritis Pain Gel is a topical nonsteroidal anti-inflammatory and pain relieving cream that provides fast relief from aches, and stiffness. It is a topical pain reliever that is used to reduce joint and muscle soreness. It can help you relax and can be soothing. Joint pain relief gel comes in various types and some may work better than others depending on the cause of your joint or muscle soreness.