You have a headache. Do you drink some fluids and take a rest? Or do you reach for the painkillers? For most of us, the latter is likely to be the first port of call. With our increasingly busy lifestyles, we tend to opt for a quick fix to our ailments, and this often involves a pill of some kind. But have we become too reliant on modern medicines? And if so, could this be doing us more harm than good?