Fifty patients with prolapse of the mitral valve and clinical diagnosis of migraine are analyzed, all being given a cardio-circulatory examination for an adequate clinical correlation between both illnesses. In this study we show a comparison of the patient's age, the duration and frequency of cephalic attacks, and their relationship to prolapse of the mitral valve, commenting on the therapeutic benefits for these patients. An analysis of the data which are presented suggests a common frequency of migraine among those patients who have mitral valve degeneration.