What do we know already?
Headaches are common - almost everyone gets them sometimes - and many people's first response is to reach for the aspirin, paracetamol, or ibuprofen. Migraine sufferers might use specialised migraine drugs, called triptans.
If you get very frequent headaches, however, painkillers may be part of the problem. If you get a headache on 15 days a month or more, and have been taking painkillers a similar number of times without seeing an improvement, it's possible that the painkillers are making your headaches worse.