Located in Aso City, Kumamoto Prefecture, Aso Onsen Hospital is a medical facility specializing in internal medicine. Situated in the Uchimaki area, the hospital provides internal medicine services. Operating hours are from 8:30 AM to 12:30 PM in the morning and 2:00 PM to 5:30 PM in the afternoon. The hospital is closed on Sundays and holidays, including the 1st through 5th Sundays, the 2nd, 3rd, and 4th Tuesdays, the 3rd Thursday, the 3rd, 4th, and 5th Saturdays, and the 4th Wednesday. Dental services are also available, with temporary suspension announced starting March 12, 2026. As a community initiative, the hospital hosts a health education program called "Wakuwaku Health Classroom" at the community center across from the facility. The hospital accepts credit cards and electronic payments, and offers parking. The facility is wheelchair accessible and designed to accommodate elderly patients. English language support is available. Through these medical services and facilities, the hospital meets the healthcare needs of the local community.