• 医院いいん — clinic
• 医者いしゃ — doctor
• 医学いがく — medical science
• 医師いし — medical doctor
• 医療いりょう — medical care
• 名医めいい — renowned doctor

The character 医 is a simplified form of 醫. It originally combined symbols representing a medicinal wine container and the act of healing. Now, it's a common symbol for medicine and health-related fields.

医者いしゃに行いきました。
I went to the doctor.

医療いりょうの技術ぎじゅつが進すすんでいます。
Medical technology is advancing.