Final answer:
The nurse should inform Ms. Jones that a thorough evaluation by a doctor is required to determine the cause of her chest pain and to ensure it is not related to a heart attack or another serious condition, without causing undue alarm.
Step-by-step explanation:
The nurse's best response to Ms. Jones, who reports severe pain under her right breast and is concerned about a heart attack, is to neither confirm nor dismiss her concerns without proper assessment. While chest pain is a common symptom of a myocardial infarction (MI), also known as a heart attack, it is important to recognize that heart attack symptoms in females may not follow the classic presentation of left-sided chest pain. Therefore, a prompt and thorough evaluation by a physician is essential to determine the cause of the pain and to rule out a heart attack or other serious conditions. A nurse should convey this urgency without causing unnecessary alarm and ensure that Ms. Jones receives the appropriate medical attention.