Aspirin is an NSAID class medication.
The only exception is acetaminophen; it's usually classed in the discussion of pain relievers but is in a class by itself.
I took NSAIDS for thirty years on physician recommendation and nobody ever discussed acetaminophen as an effective pain reliever. Finally I had a bleeding ulcer from an allergic reaction to penicillin and so took a chance that acetaminophen could actually do something. My blood pressure readings dropped 20 points on both systolic and diastolic -- and no longer have chronic gastric distress.
A lot of people than suspected are probably allergic to NSAIDS in the same way I was with all these indeterminate afflictions that can't be explained. Acetaminophen is worth a try -- even if your doctor has been brainwashed into thinking it isn't as effective a pain reliever. Studies haven't indicated that; its weakness is that it doesn't possess as effective anti-inflammatory properties.