Doi Gastroenterology Clinic, located in Kita-sai-in-cho, Matsuyama City, Ehime Prefecture, is an internal medicine clinic established in 2017. The clinic treats a wide range of internal medicine conditions, focusing on gastrointestinal diseases as well as lifestyle-related diseases and infections. The director holds certifications from the Japanese Society of Internal Medicine, the Japanese Gastroenterological Association, the Japan Gastrointestinal Endoscopy Society, and the Japanese Society of Hepatology, and treats conditions related to the gastrointestinal tract, liver, biliary system, and pancreas. For examinations, the clinic performs endoscopic procedures such as gastroscopy and colonoscopy, with options for thin transnasal endoscopes and sedation based on patient preference. Accordingly, afternoon gastroscopy appointments are available for patients who wish to visit after work on weekdays. For inflammatory bowel diseases, the clinic collaborates with specialist hospitals in Matsuyama City, and Saturday afternoon and Sunday appointments are offered to accommodate busy patients. Home medical care services are also available for patients who have difficulty visiting the clinic. The clinic has a parking lot and is wheelchair accessible, with English language support available. Consultation hours are 9:00-12:30 and 14:30-18:30, with closures on Tuesdays, the 1st, 3rd, and 5th Sundays, public holidays, Obon, and New Year's.