What Is Non-Maleficence? Key Facts for UCAT and Medical Interviews

Before answering ethical scenarios in the UCAT Situational Judgement Test (SJT) or medical school interviews, it is essential to understand what non-maleficence means and why it is such an important principle in medicine.

Key Takeaways: Non-Maleficence in Medicine

Non-maleficence means “do no harm.”
It is one of the Four Pillars of Medical Ethics alongside autonomy, beneficence, and justice.
Doctors must avoid causing unnecessary physical, emotional, or psychological harm to patients.
The principle applies to both actions and omissions — failing to act can also cause harm.
Non-maleficence is central to patient safety, informed consent, and risk management.
Common UCAT and MMI ethical scenarios involving non-maleficence include:
- Refusal of treatment
- End-of-life care
- Over-treatment
- Medical errors
- Antibiotic overprescribing

Definition of Non-Maleficence (Four Pillars of Medical Ethics)

Definition

Non-maleficence means:

“The duty to avoid causing harm to patients.”

This includes harm caused through:

Actions
Negligence
Poor communication
Unsafe treatments
Failure to intervene appropriately

In Simple Terms

Doctors should avoid doing anything that causes unnecessary harm or risk to patients.

Sometimes this means:

Choosing not to treat
Avoiding risky procedures
Stopping harmful interventions
Prioritising comfort and dignity

Why Non-Maleficence Matters in Medicine

Non-maleficence underpins safe and ethical medical practice across the NHS.

Why It Is Important

Prevents Unnecessary Harm

Doctors must weigh risks and benefits before offering treatment.

For example:

Avoiding unnecessary surgery
Not prescribing antibiotics for viral infections
Preventing medication errors

Protects Vulnerable Patients

Some patients are more vulnerable to harm, including:

Elderly patients
Frail patients
Children
Immunocompromised patients

Aggressive treatments may sometimes cause more harm than benefit.

Supports Patient Safety

Patient safety is one of the NHS’s core priorities.

Non-maleficence encourages doctors to:

Minimise complications
Reduce medical errors
Practise evidence-based medicine
Escalate concerns appropriately

Forms Part of GMC Good Medical Practice

The GMC states:

“Make the care of your patient your first concern.”

This directly reflects the principle of non-maleficence.

Non-Maleficence vs Beneficence

These two ethical pillars are closely linked but different.

Principle	Focus	Example
Beneficence	Doing good	Starting chemotherapy to treat cancer
Non-Maleficence	Avoiding harm	Withholding chemotherapy if side effects outweigh benefits

In many ethical scenarios, doctors must balance:

Helping the patient
Avoiding unnecessary harm

This balance is commonly tested in UCAT SJT questions and MMIs.

Real-Life Examples of Non-Maleficence

Example 1: Antibiotic Overprescribing

A patient requests antibiotics for a viral cold.

Ethical Issue

Giving antibiotics unnecessarily may:

Cause side effects
Increase antimicrobial resistance (AMR)
Harm wider public health

Applying Non-Maleficence

The doctor should:

Explain why antibiotics are not appropriate
Offer supportive treatment
Educate the patient safely

This demonstrates:

Patient safety
Responsible prescribing
Avoidance of unnecessary harm

Example 2: Charlie Gard Case

The case of Charlie Gard case involved a terminally ill infant with mitochondrial DNA depletion syndrome.

Ethical Conflict

Parents wanted experimental treatment abroad.
Doctors believed treatment would prolong suffering.

Outcome

The courts ruled that continuing treatment would not be in Charlie’s best interests.

Why This Matters

This case highlights:

Non-maleficence
Best interests
End-of-life ethics
Limits of parental autonomy

Sometimes “doing no harm” means withholding treatment.

Further scenarios involving non malificence

Prescribing antibiotics for a likely viral illness

Avoid unnecessary treatment and side effects.
Explain why antibiotics are unlikely to help.

Request for unnecessary imaging

Consider radiation exposure and incidental findings.
Explain risks and benefits.

High-risk surgery in a frail patient

Balance operative risks against potential benefit.
Involve the multidisciplinary team and patient in shared decision-making.

Medication error

Prioritise patient safety.
Be open and honest (Duty of Candour).
Escalate, document, and learn from the incident.

Non-Maleficence in UCAT SJT Questions

The UCAT Situational Judgement Test frequently assesses non-maleficence indirectly.

Common Themes

You may encounter scenarios involving:

Patient safety concerns
Unsafe prescribing
Medical errors
Fatigue and burnout
Escalating concerns to seniors
Confidentiality breaches
Risky behaviour by colleagues

What UCAT Examiners Want to See

Strong answers usually:

Prioritise patient safety
Escalate concerns appropriately
Avoid unnecessary risk
Follow GMC guidance
Show professionalism and empathy

MMI Example Question on Non-Maleficence

Question

“A parent wants their child to receive an unproven alternative therapy that may be harmful. What would you do?”

Model Structure

Step 1: Acknowledge the Ethical Issue

This scenario involves balancing:

Parental autonomy
Child welfare
Non-maleficence

Step 2: Prioritise Patient Safety

As a doctor, my primary responsibility is to avoid causing harm to the child.

If the treatment is unsafe or unsupported by evidence, I would be concerned about:

Physical harm
Delayed effective treatment
Emotional distress

Step 3: Communicate Empathetically

I would speak calmly and compassionately with the parents to understand:

Their concerns
Their motivations
Their understanding of the risks

Empathy is essential in maintaining trust.

Step 4: Escalate Appropriately

I would involve:

Senior colleagues
The multidisciplinary team (MDT)
Ethics teams if necessary

This ensures decisions are safe and carefully considered.

Step 5: Conclude Safely

Ultimately, the child’s best interests and safety must guide decision-making.

If the treatment poses significant harm, I would not support it and would instead explore safer evidence-based alternatives.

How to Answer Non-Maleficence Questions in Interviews

A strong structure can help you answer ethical scenarios clearly and confidently.

Step-by-Step Structure

1. Define Non-Maleficence

Explain that it means: “Avoiding harm to patients.”

2. Identify the Ethical Conflict

Which ethical principles are in tension?

Autonomy vs non-maleficence
Beneficence vs non-maleficence

3. Apply the Four Pillars

Discuss: Autonomy, Beneficence, Non-maleficence, Justice

4. Consider Capacity and Consent

Ask if: Does the patient have capacity? Have risks been explained properly? Is consent informed?

5. Communicate Empathetically

Show Compassion, Active listening, Respect

6. Escalate Concerns

Involve Seniors, MDT, Ethics committees if appropriate

7. Reach a Balanced Conclusion

Your final decision should be:

Safe, Ethical, Patient-centred, Legally appropriate

Twelve Questions and Answers

1. What is non-maleficence?

Non-maleficence is the ethical principle that healthcare professionals should avoid causing harm to patients. It requires careful consideration of the risks and potential adverse effects of investigations, treatments, and clinical decisions.

2. How does non-maleficence differ from beneficence?

Beneficence means acting in the patient's best interests and promoting their wellbeing.
Non-maleficence means avoiding or minimising harm.

For example, prescribing antibiotics to treat an infection is beneficence, while checking for allergies and side effects before prescribing is non-maleficence.

3. Can harm ever be justified in medicine?

Yes. Many medical interventions carry some risk of harm. The principle of non-maleficence does not require avoiding all harm; it requires ensuring that the expected benefits outweigh the risks and that harm is minimised wherever possible.

For example, surgery causes pain and carries risks, but may be justified because it offers significant health benefits.

4. How do you apply non-maleficence in everyday clinical practice?

I apply non-maleficence by:

Following evidence-based guidelines
Checking for allergies and contraindications
Obtaining informed consent
Using safe prescribing practices
Escalating concerns when patient safety is at risk
Learning from incidents and near misses

5. How does informed consent relate to non-maleficence?

Informed consent helps minimise harm by ensuring patients understand the risks, benefits, and alternatives before agreeing to treatment. This allows them to make informed decisions about accepting potential risks.

6. What would you do if a patient requests a treatment that may cause more harm than benefit?

I would explore the patient's concerns and expectations, explain the risks and benefits clearly, discuss alternative options, and advise against treatments where harm outweighs benefit. If the patient still wishes to proceed, I would seek senior advice and ensure decisions are made within professional and ethical standards.

7. How does non-maleficence apply to prescribing?

Non-maleficence requires:

Prescribing only when indicated
Considering side effects and interactions
Using the lowest effective dose when appropriate
Monitoring for adverse effects
Reviewing medications regularly

8. Can non-maleficence conflict with patient autonomy?

Yes. A competent patient may choose an option that carries significant risk. In such situations, clinicians should provide clear information and recommendations but respect the patient's autonomous decision if they have capacity.

Example: A competent patient refusing a life-saving blood transfusion.

9. How does non-maleficence apply to end-of-life care?

Non-maleficence involves avoiding burdensome or futile treatments that may prolong suffering without meaningful benefit. It also supports symptom control and comfort measures that reduce distress and improve quality of life.

10. Describe a situation where non-maleficence and beneficence may conflict.

A patient with severe infection may require surgery that carries significant operative risk.

Beneficence supports surgery because it may save the patient's life.
Non-maleficence highlights the risks of complications and harm.

The clinician must balance both principles and determine whether the potential benefits justify the risks.

11. What role does patient safety play in non-maleficence?

Patient safety is a practical application of non-maleficence. Measures such as incident reporting, infection control, safe handovers, surgical checklists, and medication reconciliation all aim to reduce avoidable harm.

12. How would you answer "What does 'first, do no harm' mean?"

It means clinicians should carefully consider the potential harms of any intervention, minimise avoidable risks, and ensure that treatments are justified by a favourable balance of benefits over harms.

Further Questions

A patient refuses treatment despite a high risk of death. What would you do?

A doctor prescribes antibiotics unnecessarily because a patient insists. Discuss the ethical concerns.
Parents refuse a blood transfusion for their child. How would you approach the situation?
A colleague appears too tired to work safely. What should you do?
An elderly patient wants aggressive treatment that may significantly reduce quality of life. How would you balance beneficence and non-maleficence?

One-line interview summary

Non-maleficence is the duty to avoid or minimise harm by carefully balancing risks and benefits, practising safely, and placing patient safety at the centre of clinical decision-making.