Located in Kai City, Yamanashi Prefecture, Nagaseki Headache Clinic, operated by Hisuikai Medical Corporation, is a specialized headache clinic specializing in neurosurgery. As a clinic dedicated to headache treatment, it addresses various headache disorders including chronic headaches and migraines, boasting a track record that once ranked third nationwide in patient volume. For migraine prevention, the clinic has introduced cutting-edge preventive injectable medications such as Emgality, Ajovy, and Aimovig, and actively treats menstrual-related migraines and pediatric and adolescent patients aged 6 to 17. The facility is also equipped with WatchPAT, a diagnostic device for sleep apnea syndrome, enabling examination of sleep disorders often associated with headaches. The clinic director has appeared on NHK's 'Asaichi' and has published books, widely sharing specialized knowledge on occipital neuralgia and medication overuse headache. The facility features barrier-free design and a parking lot, accepts credit cards and electronic payments, and offers a patient-friendly environment. Patients suffering from headaches visit from both within and outside Yamanashi Prefecture to receive specialized diagnosis and treatment.