Iodine deficiency disorders (IDD) constitute one of the major health problems of the world. In the Sudan during the last 50 years a number of reports appeared about the prevalence of goiter in different region in Sudan. In this book we concentrated on the central area around the White Nile which lies between Kosti and Khartoum. The book illustrated on the prevalence of ID in schoolchildren aged 6-18 years and estimating the iodine content in local water and iodized salt.