Ooka Clinic, a medical corporation located in the Guenji area of Minami-ku, Yokohama, is a clinic with departments in Internal Medicine, Gastroenterology, Pediatrics, and Dermatology. In the Gastroenterology department, transnasal endoscopy and gastroscopy using sedatives are performed to reduce patient burden. Services include stomach cancer screening, Helicobacter pylori eradication, and ultrasound imaging. In the field of hepatitis, oral antiviral treatment is provided for chronic hepatitis B and C. The Pediatrics department offers rapid infectious disease testing for quick diagnosis. The facility is barrier-free equipped and provides English language support. A 24-hour online appointment system is available for efficient scheduling.