During the 2nd World War, large numbers of allied military personnel in south-east Asia became prisoners-of-war (POWs) of the Japanese. During their internment of three and a half years, they suffered undernutrition, exposure to tropical diseases and frequently overwork. Perhaps the harshest POW experience was the construction of the railway between Thailand and Burma. This paper explores the medical conditions during Far East imprisonment, and in particular on the Thai-Burma Railway, as well as the long-term health effects in post-war decades.