The patients referred from our hospital at the Department of Oral Surgery, University of Tokyo, during the two years from January 1990 to December 1991 were analyzed statistically. The results were as follows: 1. Our subjects were 1,152 patients (24.2% of first-time patients), 540 males and 612 females. 2. Concerning age distribution, the majority was in their forties, fifties and sixties. 3. More patients were from internal medicine, ENT clinic, plastic surgery and cardiothoracic surgery. 4. On the number of patients categorized by disease at other departments, the largest number was cardiovascular disease. 5. On the number of patients categorized by disease at our department, the majority were dental diseases (dental caries, marginal periodontitis and missing teeth).