None of us are your doctors but Naproxen has well-known gastric issues up to ulcers and stomach bleeding which is why it's advised to be taken with food and why it's also often prescribed with a PPI or H2 Antagonist. Cox-2 selectives such as Celecoxib greatly reduce this risk but seem to be associated with some small cardiovascular risk (admittedly this is a feature of all NSAIDs though less so in Naproxen apparently).