Per the title, despite all of the medical education a doctor receives, his best start in diagnosing the patient's condition is to find where the pain is and the patient is the best judge of identifying the location. The doctor starts with asking him, "Tell me where it hurts."
Ming-Na Wen (Jing-Mei Chen) and Tzi Ma (Mr. Yeung) would later go on to appear in the Season One: Episode Four the Agents of S.H.I.E.L.D episode Girl in the Flower Dress.