Located in Kojimachi, Chiyoda-ku, Tokyo, Hananzamon Gastrointestinal Clinic is a medical facility specializing in gastroenterology. Emphasizing early detection and early treatment, the clinic was established in 1997 as a specialized center for endoscopic examination and treatment. Focusing on upper gastrointestinal endoscopy, the clinic examines the pharynx, larynx, vocal cords, esophagus, stomach, and duodenum, detecting micron-sized cancers through observation using various staining methods. The clinic offers painless and safe endoscopic examinations based on the Shinya insertion method developed by Professor Hiromi Shinya, and also supports painless examinations using mild sedatives and sleeping agents so that examinations can be performed while the patient is asleep. The clinic places great emphasis on infection control through a fully developed complete disinfection system that uses large amounts of running water for complete sterilization and cleaning, regular bacterial testing, and the use of disposable instruments. In cooperation with an examination center specializing in diagnostic imaging, comprehensive health checkups are also available.