Painkillers are not site specific unless delivered locally (i.e. injection). Ibuprofen is systemically absorbed and will work at any area of pain while it is still actively in your bloodstream-- usually 6-8 hours.
The absorption of medicine by your blood for any medications - for anything you eat or drink - is given by formulas involving time. This means that you would ideally have a constant amount of medicine in your body for a given amount of time after taking it. Therefore, any type of pain treatable by the medicine you took will be lessened if felt during the time the medicine is effective (the time it's still in your system).
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