Keikoukai Higashi-Shinjuku Clinic is a medical facility specializing in internal medicine, located on the 3rd floor of Daito Building in Okubo, Shinjuku-ku, Tokyo. It has medical collaboration with Keio University Hospital, Tokyo Metropolitan Okubo Hospital, National Center for Global Health and Medicine, and Tokyo Yamanote Medical Center to provide specialized medical care. Clinical departments are centered around internal medicine, with nephrology, gastroenterology, and neurology. A pain clinic is also available, treating various pain conditions including migraines, tension headaches, facial pain, cervical and lumbar disc herniation, neuropathic pain, and cancer pain on Monday and Thursday afternoons. Clinic hours are Monday through Friday from 9:30 AM to 12:30 PM and 2:00 PM to 6:00 PM, Saturday from 9:00 AM to 12:30 PM, and closed on Sundays and holidays. Prior contact is required for fever visits. The facility is barrier-free and offers services in English and Korean.