Located in Chitose-cho, Hachioji City, Tokyo, Shinya Naika is a clinic providing comprehensive internal medicine services. Dr. Eiji Shinya, the clinic director, trained at Nippon Medical School and has research experience at the U.S. National Institutes of Health (NIH) and the French National Centre for Scientific Research (CNRS), establishing the practice in 2019. The clinic handles common symptoms such as colds, abdominal pain, and headaches, as well as lifestyle-related diseases including diabetes, hypertension, and dyslipidemia. Additionally, it treats allergic conditions like hay fever, bronchial asthma, and osteoporosis. The clinic places particular emphasis on thyroid disorders, offering specialized care for symptoms caused by thyroid hormone abnormalities. For hay fever, sublingual immunotherapy is available, aiming for fundamental constitutional improvement. The clinic also provides English and French medical certificates and prescriptions needed for overseas travel, along with vaccination consultations, addressing international medical needs. Clinic hours are 9:30 AM to 12:00 PM and 2:00 PM to 6:00 PM, with closures on Thursdays, Sundays, national holidays, and Saturday afternoons. Credit cards and electronic payments are accepted, and parking is available, ensuring a convenient environment for patients.