The four pillars of medical ethics, autonomy, beneficence, non-maleficence and justice, come up at nearly every medical school interview, either as a direct question or underneath an ethics scenario. Some schools ask you to define them and give an example of each; others ask for an example of each from your own work experience. This article covers the definitions, what the marking criteria reward, what happens when two pillars conflict, a set of real examples, and the questions that usually follow.
What do you understand by the four principles of healthcare ethics? Give an example of each.
- What happens when two of the principles conflict?
Why medical schools ask it
These four principles underpin ethical reasoning in medicine. When they conflict, you explain the trade-off, choose an appropriate course, and state your reasoning clearly. Interviewers ask about them directly because they are the vocabulary of every ethics station: a candidate who cannot define them will struggle with confidentiality, consent, resource allocation and mistake scenarios alike.
The question also tests whether you understand that the pillars are a framework for reasoning, not a formula. None of them automatically outranks the others, and the interesting questions are the ones where two of them pull in different directions.
What the marking criteria reward
The marking sheet for this station has six content points, plus the usual mark for communication:
- Names all four principles: autonomy, beneficence, non-maleficence and justice
- Defines each accurately, distinguishing beneficence (doing good) from non-maleficence (avoiding harm)
- Gives a relevant example for each principle
- Links autonomy to informed consent and mental capacity
- Gives an example of two principles conflicting and explains how it would be resolved (no fixed ranking; a capable adult's informed refusal is respected)
- Recognises the principles are a framework for reasoning that sits alongside the law and regulator guidance, not a formula
The two that separate candidates are the fourth and fifth: linking autonomy to capacity and informed consent, and giving a realistic example of two principles conflicting with a sensible resolution. Naming and defining the four is expected of everyone.
The four pillars
- Autonomy :
- Respecting the patient's right to make their own decisions about their care, even if you disagree with those decisions.
- Beneficence :
- Acting in the patient's best interest: promoting good and providing benefit.
- Non-maleficence :
- Avoiding harm. Sometimes this conflicts with beneficence when treatments carry risks.
- Justice :
- Fair and consistent allocation of resources; treating patients equitably regardless of background.
The model answer below gives an example for each, then works through what happens when they conflict, and ends with the limits of the framework:
1. Introduce the framework
The four principles, often called the four pillars, were set out by the American ethicists Tom Beauchamp and James Childress in the late 1970s. They give healthcare professionals a shared structure for thinking through a difficult decision. None of them automatically outranks the others.
2. The four principles with examples
3. When principles conflict
Conflicts are common, and working through them is the purpose of the framework.
There is no fixed ranking. The clinician gathers the facts, considers each principle, checks the law and professional guidance, and seeks senior or team advice where the answer is unclear.
4. Limits of the four principles
5. Reflection
As a healthcare student I would use the pillars as a checklist for any dilemma: what does the patient want, what will help, what could harm, and is it fair? Using a structure like this keeps decisions consistent and makes them easier to explain to patients and colleagues.
Examples from work experience
Bristol and Plymouth ask the harder version: an example of each pillar from your own work experience or volunteering, and a moment where two pulled apart. Textbook definitions score poorly on that station; a short, real example for each scores well. These are the kind of moments that work, one per pillar:
- Autonomy
- While shadowing in a clinic, I saw a clinician explain two treatment options to an older patient. She drew a simple diagram, checked what the patient had understood and then gave him time to decide. He chose the more conservative option, which was not the one she had recommended, and she supported that choice without pressure. It showed me that autonomy depends on good information, not just on asking for a signature.
- Beneficence
- Volunteering in a care home, I noticed a carer who learned that one resident with dementia became calmer when her favourite music was playing, so she put it on before personal care. Nobody had asked her to. That small act was clearly in the resident's best interests, and it taught me that beneficence is often about attention to the individual, not only about big clinical decisions.
- Non-maleficence
- On a hospital ward I watched a nurse double-check a patient's allergy status and wristband before giving a medicine, even though the ward was very busy. The check took seconds. It showed me that avoiding harm is built into routine habits, and that pressure of time is exactly when those habits matter most.
- Justice
- At a reception desk I saw staff book urgent slots according to clinical need, not according to who was most insistent. One caller was frustrated at being offered a routine appointment, and the receptionist explained calmly how urgency was assessed. That was justice in practice: a limited resource being shared fairly and transparently.
- In conflict
- In the care home, one resident who had capacity often refused her walking frame because she valued her independence, even though staff worried about falls. Autonomy and non-maleficence pulled in different directions. The staff did not force the issue. They explained the risk, respected her decision, and reduced the harm in other ways, by clearing obstacles and checking on her more often. I learned that the pillars are a framework for weighing a decision, not a formula, and that a capable adult's choice carries great weight even when others would choose differently.
Practise this question out loud
Try answering it with the AI interviewer: it asks the question, follows up on what you say, and marks you against the points above.
Common follow-up questions
The usual probes are "is any one of the four more important than the others?" (no fixed ranking, but a capable adult's informed refusal is respected) and "are the four principles enough on their own?" (they sit alongside the law, confidentiality, honesty and GMC guidance). Beyond those, the pillars are the frame for most ethics scenarios:
Thinking about your own work experience or volunteering, can you give an example of each of the four pillars being put into practice?
Asked at Bristol and Plymouth. The examples above are the shape to aim for. Keep every patient anonymous.
A 13-year-old asks for contraception and does not want you to tell her parents. What should you do?
Autonomy against beneficence and non-maleficence, with safeguarding in the middle.
When should you breach patient confidentiality?
Autonomy and trust against justice and the protection of others.
Why should bariatric surgery be funded by the NHS when obesity is often viewed as self-inflicted?
Asked at Bristol, Imperial and Southampton. Justice, and the argument that the NHS does not ration by blame.
Should it be compulsory for organ recipients to be donors?
Asked at Lancaster, Barts, Cardiff and Southampton. Justice and autonomy, and the soft opt-out system the UK actually uses.
Common pitfalls
Things to avoid when answering the question:
- Listing the four words with no definitions or examples.
- Treating beneficence and non-maleficence as the same thing.
- Claiming autonomy always wins without mentioning capacity.
- Saying that a patient can demand any treatment they wish. Autonomy gives the right to choose between options offered and to refuse, not to insist on treatment that is not clinically appropriate.
- Forgetting justice :
- It is the pillar candidates most often leave out or cannot illustrate. Have an example ready.
- Being too rigid :
- Context matters in ethics. Blanket statements like "autonomy always wins" ignore capacity and the nuances that make these questions interesting.
- Forgetting to conclude :
- After exploring both sides of a conflict, say what should happen. Sitting on the fence is unsatisfying.
Which schools ask it
Frequently asked questions
Who came up with the four pillars?
Tom Beauchamp and James Childress, in Principles of Biomedical Ethics, first published in 1979. You do not need the reference, but knowing the names takes a second and shows you have read around the subject.
Is one pillar more important than the others?
No fixed ranking. In practice, a capable adult's informed refusal is respected, which makes autonomy decisive in many cases, but only once capacity and informed consent are established. When the patient lacks capacity, beneficence carries more weight.
Are there frameworks beyond the four pillars?
Yes, and interviewers like you to know it. The pillars sit alongside confidentiality, honesty and the duty of candour, the law (the Mental Capacity Act, the Equality Act), and the GMC's Good Medical Practice. For professionalism scenarios the SPIES framework (seek information, patient safety, initiative, escalate, support) is often more useful.