Why does Advil work? Palliation for small, temporary complaints

I was told palliation - defined as giving an “anti” treatment (antibiotics, anti-inflammatory, analgesic, etc) - would “drive the pathology deeper” or “make someone worse in the long run!” But the question in my mind was always: “but painkillers get rid of my headache - and I don’t get some horrible disease after using them, and the headache doesn’t immediately come back when the painkiller wear off, so what’s going on?” Well, I recently found what Hahnemann says on the matter in the introduction to Opium.