I'd be very careful. As I said above, I got 2 simultaneous stomach ulcers from taking daily NSAIDs (aspirin, ibuprofin, naproxen, etc.) for back and arthritis pain. Now I have to avoid them as much as possible because once you get an ulcer you're prone to getting more. You can use the aspirin topically (Aspercreme, etc.), but don't put so much in your stomach. Also try turmeric and other natural anti-inflammatories and see if they help your back pain.