When anti-inflammatories are taken by mouth they work by blocking (inhibiting) the effect of chemicals (enzymes) called cyclo-oxygenase (COX) enzymes. COX enzymes help to make other chemicals called prostaglandins. Some prostaglandins are involved in the production of pain and inflammation at sites of injury or damage. A reduction in prostaglandin production reduces pain and inflammation.
That said, why not try it? It’s almost certainly safer than popping ibuprofen! Although not tested and approved for reckless experimentation on any pain problem, obviously the entire point of Voltaren® Gel is to limit exposure to the active ingredient. So you might choose to experiment — taking full responsibility for your actions, of course, and not suing me if something goes horribly wrong, because of course I’m not actually recommending it. 😉 Seriously: just run it by your doctor.
I’m not saying NSAIDs are useless. They have their place. If you’re recovering from surgery or a major injury, traditional over-the-counter pain relievers are good for controlling inflammation, swelling, and pain, but NSAIDs are far too powerful for over-the-counter, everyday use. Unlike a lot of natural pain relievers, NSAIDs also don’t address the cause of inflammation or pain; they just mask the symptoms.