A polite way to refer to a medical doctor (physician), someone who examines and treats illnesses or injuries.
明日、熱があったらお医者さんに連れて行くよ。
If you have a fever tomorrow, I'll take you to the doctor.
子どもが風邪をひいたので、お医者さんに診てもらった。
Our child caught a cold, so we had them seen by the doctor.
お医者さん、診察の予約をお願いします。
Doctor, I'd like to make an appointment for a consultation, please.