Pathological gambling is the impulse control disorder most frequently reported in Parkinson's disease. This association was reported for the first time in the scientific literature about ten years ago in the form of case reports. The hypothesis of an iatrogenic origin was initially proposed and almost all dopaminergic drugs have subsequently been implicated in the pathogenesis of pathological gambling. The authors report the case of a patient who developed pathological gambling behaviour associated with Parkinson's disease, by comparing the course of the neurodegenerative disease and its therapeutic management, and the course of gambling behaviour and its addiction management. Several aetiological and diagnostic hypotheses are discussed, apart from the iatrogenic hypothesis for these disorders, in order to elucidate the links between these two pathological entities.