Over the 3 years from 1982 to 1984, a total of 34 patients were seen in the Accident and Emergency Department of St Thomas' Hospital, London, as a result of the London Marathon. Clinical details are discussed. Considering the number of annual runners who take part, the casualties from the finish of this event are low. This short report suggests that the 3 years' preparation and organization for the finish of the London Marathon were consistently effective.