Historians of medicine are often gloomily familiar with clinicians' incursions into their intellectual arena. We physicians offer hagiographic biographies of obscure nineteenth-century medical figures, triumphalist narratives of medical progress and – the most heinous offence – retrospective diagnosis of ailments afflicting historical characters. But clinicians have also offered some excellent insights to the discipline. As a medical practitioner, I intend to argue that clinical insight can be valuable; not in providing answers – here, clinicians' contemporary interpretations of disease and its treatment can lead us to become unstuck – but in raising questions which might not occur to historians.