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The four pillars of medical ethics, consent and capacity, confidentiality, and how to reason through a scenario you have never seen before.
A shared vocabulary, not a checklist
Almost every ethics question in an interview can be discussed using four principles: autonomy, beneficence, non-maleficence, and justice. Naming them is not the goal. The goal is using them to explain why a decision is difficult, because in most real scenarios two of these principles point in different directions.
Autonomy and beneficence
Autonomy is a patient's right to make decisions about their own body and care, including decisions a doctor disagrees with. Beneficence is the duty to act in the patient's best interest. These two collide constantly: a doctor might believe a treatment is clearly in a patient's best interest, but the patient has the right to refuse it anyway.
A competent adult patient with a treatable infection refuses antibiotics because of a personal belief, even though the doctor is confident the infection will worsen without them. Which principle gives the patient the right to refuse?
Autonomy protects a competent patient's right to refuse treatment, even when the doctor believes that treatment is clearly beneficial. The doctor's duty is to inform, not to override that choice.
Non-maleficence and justice
Non-maleficence means avoiding unnecessary or disproportionate harm. It does not mean avoiding all harm, since almost every medical intervention carries some risk or discomfort. The relevant question is always whether the harm is proportionate to the benefit. Justice is about fairness: treating similar cases similarly and distributing limited resources without discrimination.
Non-maleficence means a doctor must never do anything that causes a patient any harm, including minor discomfort.
False
Almost every treatment, including a simple injection, causes some harm or discomfort. Non-maleficence is about ensuring harm is not unnecessary or disproportionate to the benefit gained.
A surgeon recommends an operation with a small but real risk of serious complications, which is still the best available option for a patient's condition. The patient asks: "Isn't it wrong for you to put me at risk like this?"
Say there is no risk at all, to reassure the patient
Worth reconsidering: This is dishonest and undermines informed consent, since the patient is entitled to an accurate picture of the risk before deciding.
Explain that non-maleficence is weighed against beneficence, and that a small, proportionate risk taken to achieve a much larger expected benefit is standard ethical practice, provided the patient understands and consents to that risk
Strong approach: This directly answers the patient's real question: whether taking on risk can be ethical. It can, when it is proportionate and consented to, which is the correct application of these two principles together.
Refuse to discuss the ethics and only describe the medical procedure
Worth reconsidering: This avoids a reasonable question the patient is entitled to ask and misses a chance to build trust through a clear explanation.
Valid consent requires three things: the patient must have capacity to make the decision, they must be given enough information to understand what they are agreeing to, and the decision must be voluntary, free from...
Confidentiality is a core part of the trust between a doctor and patient, but it is not absolute. It can be broken when there is a serious risk of harm to the patient or to others, when required by law, such as...
Justice in medical ethics is not only about individual fairness between two patients in front of you. It also covers how a whole health system allocates limited resources, such as beds, staff time, and expensive...
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The four pillars are a practical checklist, not a complete ethical theory. They tell you which considerations are relevant, but not how to weigh them against each other when they conflict. Underneath the four pillars...
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