Hattori Internal Medicine Clinic is an internal medicine clinic located in Koto-ku, Tokyo, with a history dating back to its establishment in 1908. The clinic features a healthcare system in collaboration with Hattori Internal Medicine Clinic II and is capable of providing services in English. Operating hours are Monday through Saturday from 9:00 AM to 12:00 PM, Monday through Wednesday and Friday from 3:00 PM to 6:00 PM, and Thursday from 2:00 PM to 5:00 PM. Reception begins 15 minutes before the start of clinic hours, and consultations are provided on a first-come, first-served basis without appointments. The clinic offers treatment for infectious diseases including COVID-19, influenza, pertussis (whooping cough), Mycoplasma infections, and RSV. Pertussis has been notably prevalent in recent years, with many adult cases; while effective antibiotics are prescribed, cough symptoms typically persist for about one month. In addition to infectious disease treatment, the clinic has introduced the Emsella machine for pelvic floor muscle strengthening, offering a self-pay treatment option where patients can receive treatment fully clothed while sitting on a chair for just 30 minutes, targeting those concerned with urinary incontinence and vaginal laxity. The clinic also handles the health supplement Equepul, which uses lactic acid bacteria that produce equol.